Edited PDFs leave fingerprints in the metadata, the object stream, and the font tables. This guide shows where to look: checking Creator/Producer fields for mismatches, reading the xref table for revision markers, inspecting font embedding for inconsistencies, and using Error Level Analysis on images embedded inside the PDF.
Key Topics Covered
PDF metadata Creator vs Producer field mismatches
xref table revision markers indicating edits
Font embedding inconsistency detection
Error Level Analysis for embedded PDF images
Timestamp manipulation in PDF modification date
Free tools vs professional forensic analysis for PDFs