Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce67fd464438f1d…

MALICIOUS

PDF

232.5 KB Created: 2009-11-07 16:21:07 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 6.0 (Windows))
MD5: 06dbc2bf96220e76834ef473350000a8 SHA-1: 747b487ec452b27d20197ebfdb1c22da820cfc9e SHA-256: 3ce67fd464438f1df56514e72a808ce48e78324d074db66eb70810e7ba8f1b58
216 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated malicious code. A secondary embedded PDF was also detected with similar suspicious findings. The ML classifier strongly flagged this PDF as malicious, and ClamAV identified it as 'Pdf.Exploit.Agent-3518'. The primary function appears to be executing an exploit via JavaScript, likely to achieve initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Exploit.Agent-3518 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-3518
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/1999/02/22-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/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js
361e2d552c12469e33ff8fa2852e32030ae803cb21c13b5b4fdb40e49597be19		 pdf-javascript-stream PDF /JS object 29 at offset 0x4F3A 29574 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0109_00.bin
ac95a2cdc2becd4e146fb6e5bc28d365ee09c61439b4dc6b2d26e6a4ed00ce9c		 pdf-objstm-decoded PDF /ObjStm 109 0 obj (inflated) 487 bytes
polyglot_child_pdf_off00036eb1.pdf
f06f7c4699983ee8ff7bc99c47f2e584db0653fabf7bdd0204ef4968c2585463		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x36EB1 13128 bytes

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