Malicious PDF — malware analysis report

Static analysis result for SHA-256 c360e1d627d18da6…

MALICIOUS

PDF

5.1 KB
MD5: 34b4e122e60a11dbc6fcdc5422af7afe SHA-1: 86d7ff5c6ffcb2bfe106341bf10d5f15f71145e8 SHA-256: c360e1d627d18da642f1ade9d9695af229def80b89e3b7cdd781caa8d742cb03
144 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Agent-36178) and a machine learning classifier. Heuristics indicate the presence of JavaScript actions and embedded JS streams, along with ASCIIHexDecode and ASCII85Decode filters, which are commonly used in PDF exploits. The ML classifier's high confidence score further supports the malicious nature of the file. The lack of readable document body text prevents a more specific determination of the lure, but the technical indicators strongly suggest an exploit delivery mechanism.

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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