How does the PDF authenticity checker work?

Our PDF authenticity checker uses advanced multi-layer forensic analysis to detect if a PDF document has been modified or tampered with. The system analyzes PDF metadata including creation dates, modification timestamps, creator and producer information, and PDF version details.

We also examine the internal file structure at the byte level to identify evidence of post-creation modifications, detect digital signatures and analyze their integrity, and scan for embedded malicious code or suspicious scripts.

All detection layers feed into our proprietary risk assessment algorithm, which uses an internal confidence score (0-100) to produce the final result. You see a simple binary answer: whether the PDF has been modified (yes) or not (no). This PDF verification process helps you determine document integrity at a glance.