Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4c8e2623d09290…

MALICIOUS

PDF

22.3 KB Created: 2009-04-24 09:54:29 +02:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 7.0.5 (Windows))
MD5: 9d0cddfbcd6ef8be082ca23eaacbc9ce SHA-1: 5a77ec9e3d368249b8c876927f6c9aff844fd991 SHA-256: 6e4c8e2623d0929040cd406b508ee340a0bd9f7735b255c8b7255bdd8aa50fb5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_OBFUSCATED_NAME_OBJECT' and 'PDF_JS'. The ML classifier also flagged it as malicious with high confidence. The JavaScript is likely designed to exploit a vulnerability and download a secondary payload, a common technique for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 4

  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.

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