Malicious PDF — malware analysis report

Static analysis result for SHA-256 b146c5deae386de6…

MALICIOUS

PDF

3.6 KB Created: 2010-04-14 12:42:52 +02:00 Authoring application: PDFCreator Version 0.9.5 (via GPL Ghostscript 8.61)
MD5: e2c4c7e534485ade79ea002c63fd857e SHA-1: 6eb92c79d478e2e262537700feef8ae624cce649 SHA-256: b146c5deae386de6f7512d731995eb035d96b2762b7cb4b6769747b9f4b524ea
82 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and uses ASCIIHexDecode and ASCII85Decode filters, which are common indicators of PDF exploits. The ML classifier also flagged this PDF as malicious with high confidence. While no specific exploit or payload was identified, the presence of these elements strongly suggests an attempt to execute arbitrary code upon opening the document. No URLs were found to be malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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