Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8bb46e1721a83e…

MALICIOUS

PDF

45.2 KB
MD5: 9aefb4e30e2b3e834d7594f6bd529870 SHA-1: d44670395f73f56caf5c96b0b9c14a5dde0d4b96 SHA-256: dd8bb46e1721a83e5ed2aae7a0430400ce83f8b4beebe5963a1b36c031cd36f6
114 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier also flagged this PDF as malicious with high confidence. While the document body is heavily obfuscated and unreadable, the presence of JavaScript strongly suggests an attempt to execute malicious code, likely to download and run a secondary payload. The specific JavaScript content could not be fully analyzed due to obfuscation, but the overall pattern points to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9595

Heuristics 5

  • 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.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
1bdde0a18f782d02eb57be1fe05f2ddbf088e0754790ec8bf322d14c4f0fed24		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E8 3733 bytes

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