Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91136b44fe0c53e…

MALICIOUS

PDF

1.0 KB
MD5: d0c05272fb33d84f358c1f74f6332c47 SHA-1: 02f9dee63b6f06008abc6e3d61a2a678e8694d68 SHA-256: f91136b44fe0c53e2e3db978ad23c68f321ca92caa8cb7df9077c5cf761fe9d6
142 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and additional-actions dictionaries, which are commonly used to trigger malicious code execution upon opening. The ML classifier and correlated malicious JavaScript signals strongly indicate malicious intent. The use of ASCIIHexDecode and ASCII85Decode filters further suggests obfuscation techniques common in PDF exploits. The primary attack pattern involves leveraging these PDF features to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS
    PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
  • 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

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