How PDF Verification Works: 5-Layer Analysis

Multi-layered forensic analysis that detects modifications invisible to the naked eye

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Deep Analysis

Advanced multi-layer detection system analyzes file structure, digital signatures, and modification traces

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Receive instant verification report with modification details

PDF Metadata Analysis & Forensics

Our system performs deep validation of temporal data and authorship information, detecting anomalies that indicate tampering. We validate date sequences, timezone consistency, and cross-reference creation tools against known forgery patterns.

Internal File Structure Analysis

We examine the PDF's internal architecture at the byte level to identify evidence of post-creation modifications. This structural analysis detects digital traces that remain even when metadata is manipulated, making it our most reliable detection layer.

PDF Digital Signature Verification

We detect the presence of digital signatures and analyze their integrity. Our system identifies removed signatures, validates signature coverage, and detects modifications made after a document was signed—critical for compliance and legal documents.

PDF Security Threat Detection

Beyond modification detection, we scan for embedded malicious code, suspicious scripts, and hidden attachments that could pose security risks. This protects against PDFs weaponized for attacks or data exfiltration.

Multi-Factor Risk Scoring

All detection layers feed into our proprietary risk assessment algorithm, which calculates a confidence score from 0-100. This weighted scoring system considers the reliability of each indicator, providing nuanced results beyond simple “modified” or “original” classifications.

Privacy & Security First

We take your privacy seriously:

No Content Reading: We analyze technical file structure only, never the document content
Temporary Processing: Files not stored permanently
Secure Infrastructure: Encrypted connections

Detection Reliability

Our multi-layer analysis system provides industry-leading detection accuracy. By combining multiple independent verification methods, we achieve high confidence in our assessments.

However, as with any automated analysis tool, results should be interpreted as part of a broader verification strategy. Sophisticated manipulation techniques or unusual PDF creation workflows may occasionally produce unexpected results. Our confidence scoring system helps you understand the reliability of each analysis.

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How it Works API