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This report presents the forensic synthetic code analysis of SteveTheKiller/KillerPDF, a C# project with 3,683 GitHub stars. SynthScan v2.0 examined 146,947 lines of code across 465 source files, recording 252 pattern matches distributed across 6 syntactic categories. The overall adjusted score of 4.2 places this repository in the Likely human-written band.
The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).
This chart maps the temporal evolution of the adjusted synthetic code score across successive scan runs. An upward trajectory indicates ongoing incorporation of AI-generated code or expanding LLM-assisted scaffolding; a stable or declining trajectory may reflect active human refactoring, code removal, or the adoption of stricter authorship policies. The dashed secondary line (right axis) independently tracks total raw pattern hit count, which can diverge from the normalised score when codebase size changes significantly between scans.
Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.
This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.
The scanner identified 252 distinct pattern matches across 6 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | App.xaml.cs | 46 | // ── Machine-wide install (all users), matching Killendar / KillerShell ───────────── | COMMENT |
| MEDIUM | App.xaml.cs | 430 | // ── Palette ───────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 459 | // ── Layout ────────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 466 | // ── Title bar ─────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 488 | // ── Error header ───────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 535 | // ── Stack trace ────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 554 | // ── Button bar ─────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1152 | // ── Recent files (most-recent first, capped) ───────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1235 | // ── Root grid: title bar row + content row ────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1240 | // ── Title bar ─────────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1303 | // ── Content ───────────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1389 | // ── WinVerifyTrust P/Invoke ────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1425 | // ── Public helpers ─────────────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1512 | // ── About dialog ──────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1521 | // ── Layout ────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | App.xaml.cs | 1708 | // ── Downgrade guard ──────────────────────────────────────────────────── | COMMENT |
| MEDIUM | MainWindow.xaml.cs | 41 | // ── Split pane ───────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/PaneDrag.cs | 47 | // ── Drag feedback ─────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardMapOverlay.cs | 33 | // ── Binding table ────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardMapOverlay.cs | 41 | // ── Physical layout ──────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardMapOverlay.cs | 101 | // ── View toggle (LIST / KEYBOARD) ────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardMapOverlay.cs | 123 | // ── Board construction (once, lazily) ────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardMapOverlay.cs | 263 | // ── Caption marquee (hover a lit key whose caption is cut off) ───────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardMapOverlay.cs | 315 | // ── Layer painting ───────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Shell/SettingsPanel.cs | 684 | // ── Toolbar appearance (right-click picker on the bar) ──────────── | COMMENT |
| MEDIUM | Shell/SettingsPanel.cs | 1056 | // ── Responsive toolbar overflow ─────────────────────────────────── | COMMENT |
| MEDIUM | Shell/KeyboardShortcuts.cs | 547 | // ── Jump history (Alt+Left / Alt+Right / mouse back-forward buttons) ───────────────────── | COMMENT |
| MEDIUM | Features/Viewer/MainWindowViewerStubs.cs | 32 | // ── Annotations ────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 62 | // ── Page canvases ──────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 67 | // ── Undo ───────────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 71 | // ── Text editing ───────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 79 | // ── Text selection ─────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 83 | // ── Crop ───────────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 89 | // ── Links ──────────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 98 | // ── Save paths ─────────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Features/Viewer/MainWindowViewerStubs.cs | 101 | // ── Bound from MainWindow.xaml - see the class comment, these are load-bearing ─────── | COMMENT |
| MEDIUM | Features/Viewer/MainWindowViewerBridge.cs | 30 | // ══ INWARD: chrome the viewer reads ═════════════════════════════════════════════════ | COMMENT |
| MEDIUM | Features/Viewer/MainWindowViewerBridge.cs | 41 | // ══ INWARD: per-document state (group B - goes when the viewer owns its session) ═════ | COMMENT |
| MEDIUM | Features/Viewer/MainWindowViewerBridge.cs | 55 | // ══ OUTWARD: the viewer's members, under the names the window already calls ══════════ | COMMENT |
| MEDIUM | Features/Viewer/IViewerHost.cs | 41 | // ── Chrome the viewer updates (group A) ───────────────────────────────────────────── | COMMENT |
| MEDIUM | Features/Viewer/IViewerHost.cs | 122 | // ── Notifications, so the window can update chrome for the FOCUSED viewer only ─────── | COMMENT |
| MEDIUM⚡ | Models/ViewerState.cs | 63 | // ── Zoom / fit ────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Models/ViewerState.cs | 72 | // ── In-flight render work ─────────────────────────────────────────────────────── | COMMENT |
| MEDIUM⚡ | Models/ViewerState.cs | 81 | // ── Continuous-view bookkeeping ───────────────────────────────────────────────── | COMMENT |
| MEDIUM | Models/ViewerState.cs | 93 | // ── Gesture routing ───────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Models/ViewerState.cs | 101 | // ── Visual hosts ──────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/ColorPickerDialog.cs | 64 | // ── UI ────────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/ColorPickerDialog.cs | 213 | // ── Interaction ───────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/ColorPickerDialog.cs | 239 | // ── Eyedropper (desktop-wide) ─────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/ColorPickerDialog.cs | 292 | // ── Saved swatches ────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/ColorPickerDialog.cs | 335 | // ── Small themed control builders ─────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/ColorPickerDialog.cs | 439 | // ── Color math / parsing ─────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 37 | // ── Win32-compatible surface ───────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 85 | // ── internals ──────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 112 | // ── Tree / pinned places / recents / hidden state ──────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 298 | // ── Filters ────────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 399 | // ── Quick places (pinned + drives) ─────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 593 | // ── Navigation ─────────────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 908 | // ── Recent locations ───────────────────────────────────────────────────── | COMMENT |
| MEDIUM | Controls/FileDialog.xaml.cs | 945 | // ── Hidden / dot files ─────────────────────────────────────────────────── | COMMENT |
| 77 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | MainWindow.xaml.cs | 241 | // the popup into that field instead of free placement. | COMMENT |
| LOW | MainWindow.xaml.cs | 301 | // Whole-document search results now live on SearchController (Features/Search); Tabs.cs | COMMENT |
| LOW | Shell/SplitPane.cs | 41 | COMMENT | |
| LOW | Shell/SplitPane.cs | 81 | // The wheel focuses too. The zoom toolbar, the zoom box and Ctrl+wheel all act on the | COMMENT |
| LOW | Shell/SplitPane.cs | 261 | if (_restoringSplit) | COMMENT |
| LOW | Shell/SplitPane.cs | 341 | COMMENT | |
| LOW | Shell/SplitPane.cs | 441 | PaneBCol.Width = new GridLength(bStart, GridUnitType.Pixel); | COMMENT |
| LOW | Shell/AppScale.cs | 101 | // so the footer carries it while you are zooming and gives the line back a beat after | COMMENT |
| LOW | Shell/PaneDrag.cs | 1 | using System; | COMMENT |
| LOW | Shell/PaneDrag.cs | 21 | /// </summary> | COMMENT |
| LOW | Shell/PaneDrag.cs | 101 | { | COMMENT |
| LOW | Shell/SidebarLayout.cs | 81 | // handling, and the fake elevation gradient is gone - DocPaneBorder casts a real | COMMENT |
| LOW | Shell/SidebarLayout.cs | 101 | // The shadow caster is inside the PdfViewer control, so moving the control moves both - | COMMENT |
| LOW | Shell/SidebarLayout.cs | 121 | } | COMMENT |
| LOW | Shell/SettingsPanel.cs | 241 | // takes effect the next time a moon is toggled on. Both panes: this option changes | COMMENT |
| LOW | Shell/SettingsPanel.cs | 261 | // (2026-08-01). Re-render it with its own session swapped in - the same | COMMENT |
| LOW | Shell/SettingsPanel.cs | 681 | ViewerB.ReapplyViewMode(); | COMMENT |
| LOW | Shell/ShortcutsOverlay.cs | 1 | using System.Linq; | COMMENT |
| LOW | Shell/ShortcutsOverlay.cs | 61 | .Replace("%zout%", Services.KeyLayout.ZoomOutChar()); | COMMENT |
| LOW | Shell/TempReload.cs | 81 | // Primary fallback: use PDFium (already initialized for the page preview) to | COMMENT |
| LOW | Shell/SystemMenu.cs | 1 | using System; | COMMENT |
| LOW | Shell/FileOperations.cs | 841 | } | COMMENT |
| LOW | Shell/AnnotationBars.cs | 341 | COMMENT | |
| LOW | Shell/WindowChrome.cs | 321 | if (PagePreviewPanel?.Parent is not Grid area) return; | COMMENT |
| LOW | Shell/FullScreen.cs | 121 | // bounds FIRST, then drop to Normal: WPF restores to the just-set bounds, so the window lands | COMMENT |
| LOW | Features/About/IAboutHost.cs | 1 | namespace KillerPDF.Features | COMMENT |
| LOW | Features/Cli/CliRunner.cs | 21 | // 2026-07-31), called qualified below. No Features-to-Shell reaches remain in this file. | COMMENT |
| LOW | Features/Cli/CliRunner.cs | 41 | // | COMMENT |
| LOW | Features/Cli/BatchRunner.cs | 21 | // Resaves through The KillerPDF.Engine's deterministic full-document writer. No window, | COMMENT |
| LOW | Features/Viewer/MainWindowViewerBridge.cs | 1 | using System.Collections.Generic; | COMMENT |
| LOW | Features/Viewer/MainWindowViewerBridge.cs | 21 | /// | COMMENT |
| LOW | Features/Viewer/MainWindowViewerBridge.cs | 41 | // ══ INWARD: per-document state (group B - goes when the viewer owns its session) ═════ | COMMENT |
| LOW | Features/Viewer/MainWindowViewerBridge.cs | 101 | // hardcoded) and was the split's cross-zoom bug: FocusPane(B) -> SyncZoomBox writes the | COMMENT |
| LOW | Features/Viewer/MainWindowTabStubs.cs | 61 | COMMENT | |
| LOW | Features/Viewer/IViewerHost.cs | 1 | using System.Windows; | COMMENT |
| LOW | Features/Viewer/IViewerHost.cs | 21 | /// That audit split the coupling into three groups, and only the first belongs here: | COMMENT |
| LOW | Features/Viewer/IViewerHost.cs | 41 | // ── Chrome the viewer updates (group A) ───────────────────────────────────────────── | COMMENT |
| LOW | Features/Viewer/MainWindowViewerElements.cs | 1 | using System.Windows.Controls; | COMMENT |
| LOW | Models/ViewTypes.cs | 1 | namespace KillerPDF | COMMENT |
| LOW | Models/UndoTypes.cs | 1 | using System.Collections.Generic; | COMMENT |
| LOW | Models/LinkTypes.cs | 1 | namespace KillerPDF | COMMENT |
| LOW | Models/ViewerState.cs | 1 | using System.Collections.Generic; | COMMENT |
| LOW | Models/ViewerState.cs | 21 | /// </summary> | COMMENT |
| LOW | Models/ViewerState.cs | 41 | /// which between them cover every write: | COMMENT |
| LOW | Models/ViewerState.cs | 101 | // ── Visual hosts ──────────────────────────────────────────────────────────────── | COMMENT |
| LOW | Controls/KillerDialog.cs | 321 | MessageBoxButton buttons = MessageBoxButton.OKCancel, | COMMENT |
| LOW | Controls/FlyoutPlacement.cs | 1 | using System.Windows; | COMMENT |
| LOW | Controls/FlyoutPlacement.cs | 21 | /// rail sat near the window's right edge; "Top" opened them over the status bar. Hours went | COMMENT |
| LOW | Controls/ThumbViewportFloorConverter.cs | 1 | using System; | COMMENT |
| LOW | Controls/Anim.cs | 1 | using System; | COMMENT |
| LOW | Controls/Anim.cs | 21 | // | COMMENT |
| LOW | Controls/Anim.cs | 101 | { | COMMENT |
| LOW | Controls/PrintPreviewWindow.cs | 1361 | /// every selected page has to be encoded into the XPS package there. Driven from the UI | COMMENT |
| LOW | Controls/SidebarPageBinding.cs | 1 | using System.Collections; | COMMENT |
| LOW | Controls/FileDialog.xaml.cs | 21 | /// Themed stand-in for Microsoft.Win32.OpenFileDialog / SaveFileDialog. Same chrome, places | COMMENT |
| LOW | Controls/FileDialog.xaml.cs | 221 | // preference makes DWM composite its own rounded frame around the WINDOW rect - the | COMMENT |
| LOW | Controls/FileDialog.xaml.cs | 421 | catch { label = d.DriveType.ToString(); } | COMMENT |
| LOW | Controls/DragCursors.cs | 1 | using System; | COMMENT |
| LOW | Controls/FolderTree.cs | 21 | // current folder on open instead), no shell context menu suite. | COMMENT |
| LOW | Controls/Viewer/PdfViewer.Links.cs | 21 | // Moved from Shell/Links.cs; the namespace and class line are the only changes. Window members | COMMENT |
| 43 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| CRITICAL | Shell/Signing.cs | 853 | encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(bmp)); | CODE |
| CRITICAL | Shell/ContextMenu.cs | 64 | var tileSource = System.Windows.Media.Imaging.BitmapFrame.Create(bmp); | CODE |
| CRITICAL | Shell/TextSettingsBar.cs | 787 | encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(src)); | CODE |
| CRITICAL | Controls/Viewer/PdfViewer.TabStrip.cs | 525 | var slot = System.Windows.Controls.Primitives.LayoutInformation.GetLayoutSlot(fe); | CODE |
| CRITICAL | Controls/Viewer/PdfViewer.TabStrip.cs | 630 | var slot = System.Windows.Controls.Primitives.LayoutInformation.GetLayoutSlot(dragged); | CODE |
| CRITICAL | engine/KillerPdf.Engine/Authoring/PdfDocumentBuilder.cs | 2693 | state.SoftMask.Backdrop.Value.Components.Select(Number)))); | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | Controls/Viewer/PdfViewer.Viewport.cs | 449 | Background = Brushes.White, // empty-page scaffold while the bitmap streams in (not a dark box) | CODE |
| MEDIUM⚡ | Controls/Viewer/PdfViewer.Viewport.cs | 492 | // geometry never changes; they show the white scaffold until re-rendered (render cache | COMMENT |
| MEDIUM | Controls/Viewer/PdfViewer.Viewport.cs | 692 | img.Source = null; // slot keeps its height; white scaffold shows until re-rendered | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | Shell/TempReload.cs | 102 | // robust error recovery and will rewrite a correct xref), then retry the open. | COMMENT |
| MEDIUM | pdf-landing/technical.html | 141 | <a href="#robust" data-i18n="pt_12">Robustness</a> | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | pdf-landing/engine/engine-docs-content.js | 1 | (function(){window.KPDF_ENGINE_DOCS={"api":"# API guide\n\nThe public API is organized by PDF responsibility. Start with | CODE |