Malicious PDF — malware analysis report

Static analysis result for SHA-256 833afa2ec9422df7…

MALICIOUS

PDF

33.8 KB
MD5: fbf2f10dd31c1480384beb7bad27e8b2 SHA-1: f2b8c69e861c414eb4a2db36d74abc6a9de161f5 SHA-256: 833afa2ec9422df7f2df1afbe70973881d5490483d23e02b83ce939b044886eb
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and utilizes ASCIIHexDecode and ASCII85Decode filters, which are common in exploit-laden documents. The ML classifier strongly indicates maliciousness, suggesting the JavaScript likely attempts to exploit a vulnerability or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation