Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f54123b04dc75d…

MALICIOUS

PDF

5.2 KB
MD5: f53c62bce055cea22deccb2761d62e25 SHA-1: 1b364f7d73c017a1546130e601ddcb9b2f5977b2 SHA-256: b9f54123b04dc75d6af1c9b8ed031ec570f05a1e0f56bb7d32c01abe1df0c948
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by ML classifiers and ClamAV with the signature 'Pdf.Exploit.Agent-36178'. Heuristics indicate the presence of JavaScript, embedded JS streams, and the use of ASCIIHexDecode and ASCII85Decode filters, which are commonly used in PDF exploits. The differential parser also failed, suggesting obfuscation or structural anomalies typical of malicious PDFs. The primary attack pattern involves exploiting PDF vulnerabilities to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

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