Malicious PDF — malware analysis report

Static analysis result for SHA-256 204cbcb82b168a94…

MALICIOUS

PDF

5.1 KB
MD5: ed6381dd895c5ecefa62f338624fb846 SHA-1: 01490528a696af67668afeaf32d91c22dd7b6b53 SHA-256: 204cbcb82b168a94716f96566fbbcee5ec79c83e4b03b6e91c21d1388d5910df
144 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate the presence of JavaScript actions and embedded JS streams, along with the use of ASCIIHexDecode and ASCII85Decode filters, which are common in PDF exploits. The ML classifier's high confidence score further supports the malicious nature of the file. The specific exploit is identified as Pdf.Exploit.Agent-36178 by ClamAV.

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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