Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ddfe765ad579fd…

MALICIOUS

PDF

6.5 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library
MD5: 34f495c56f2d85c54100c3592ef2c515 SHA-1: 7514c0336e5dd22a7ed02bb8f5ba153e2894ffe0 SHA-256: 40ddfe765ad579fdf5917d8dcf1b9bf06253bd9fa3db8962e0b897a6c055fd75
166 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating it contains malicious content. The presence of embedded JavaScript, specifically a PDF JavaScript stream, suggests an attempt to exploit vulnerabilities within the PDF reader. The ClamAV detection name 'Pdf.Exploit.Agent-35646' strongly points to a known exploit targeting PDF documents. The embedded JavaScript is likely responsible for triggering the exploit and potentially downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0004_000.js
e4b4febc94f034943a8f9ad1f4c9d44b25220a2df60487591c72ef140a6b359d		 pdf-javascript-stream PDF /JS object 4 at offset 0x891 14600 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: unlikely

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