Malicious PDF — malware analysis report

Static analysis result for SHA-256 d634a61b57e22f20…

MALICIOUS

PDF

33.9 KB
MD5: 04c82298164e1a762bbf9c5e6d71a315 SHA-1: 98f2ce423b12d411f4d4e2195ee0ca68eedb350b SHA-256: d634a61b57e22f203fe5834ec7392d81b0b78e2ef456d65ce3df40283e56c6ed
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and utilizes ASCIIHexDecode and ASCII85Decode filters, which are common indicators of exploit attempts within PDF documents. The ML classifier strongly flags this PDF as malicious, suggesting it's designed to deliver a second-stage payload or exploit a vulnerability upon opening.

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