Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8193281d22ad0dd…

MALICIOUS

PDF

110.4 KB Created: 2008-02-27 16:58:09 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: 411bb2f6e560a6ec15fa28e0f0676578 SHA-1: f8756d9ce17eafdacd9b25b3664afaa21150041b SHA-256: a8193281d22ad0dd918f68a413a62136502c998f9eb115f7dd7b97c8bb7c52e0
92 Risk Score

Malware Insights

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

The PDF file exhibits multiple heuristic firings related to embedded JavaScript and embedded files, strongly indicating malicious intent. The ClamAV detection as 'Win.Trojan.Dropper-82' confirms its classification as a dropper. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common tactic for such malware. The document body is heavily obfuscated and does not provide clear user-facing lures.

Heuristics 6

  • ClamAV: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-82
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • 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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