Malicious PDF — malware analysis report

Static analysis result for SHA-256 81667505942335b7…

MALICIOUS

PDF

3.6 KB
MD5: b06912aa04a8f9bbfea0b33b023cda83 SHA-1: 6a2cb2b5d431c01c645aa70166ab0f528dc06014 SHA-256: 81667505942335b710cad0d917f191b8d4f527c5319dcc07f50d1fb43c1e8d09
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by critical heuristic firings for obfuscated name objects and embedded JS streams. The ML classifier also flagged the PDF as highly malicious. The JavaScript is likely designed to download and execute a second-stage payload, a common technique for initial compromise via malicious attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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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