Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb04b619342750d…

MALICIOUS

PDF

27.3 KB
MD5: b9950cfa15ffbd2581fcfab631931f92 SHA-1: 60139d0ca68f60b9d030801efc99bc13b89e7dee SHA-256: dcb04b619342750d2198e66c1d9e8314f71ce8171ae5fb1338edc193874ed3ec
74 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript and uses ASCIIHexDecode and ASCII85Decode filters, which are common indicators of malicious PDFs. The ML classifier strongly flags this file as malicious. The presence of JavaScript actions and streams suggests an attempt to execute code, likely to exploit a vulnerability or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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