Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b980380986a171…

MALICIOUS

PDF

5.2 KB
MD5: 111e844d858beccb7a0a2b26eeedacd0 SHA-1: 94ad85a59b8720e80c2c1b3310dddbd9ef725d6e SHA-256: c7b980380986a17109008ed5c3ba970e9516e957aa7880ad59222618ab127f28
144 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36178). The presence of JavaScript actions, embedded JS streams, and the use of ASCIIHexDecode and ASCII85Decode filters indicate an attempt to obfuscate malicious code, likely for exploitation. The differential parser failure also suggests a malformed structure typical of exploit-laden documents.

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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