Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b5f465ce4d0c84…

MALICIOUS

PDF

5.2 KB
MD5: 2a5e1700db330e0b094a01529582d276 SHA-1: 15968c426145353def610dde9ec95bcbacb816a2 SHA-256: 38b5f465ce4d0c840c8af0de2741c1391a75cc2060af8701201b10e04da9d341
144 Risk Score

Malware Insights

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

The PDF file exhibits multiple heuristic firings indicative of malicious intent, including JavaScript actions, embedded JS streams, and the use of ASCIIHexDecode and ASCII85Decode filters, which are often employed to obfuscate exploit code. The ML classifier and ClamAV detection strongly confirm its malicious nature, identifying it as Pdf.Exploit.Agent-36178. The presence of JavaScript suggests an attempt to execute code, likely to download and run a secondary payload.

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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