Malicious PDF — malware analysis report

Static analysis result for SHA-256 387be7b33cf961f7…

MALICIOUS

PDF

42.5 KB
MD5: fa59109e28e6cde8f32757d4e3bf9635 SHA-1: 135efaf1e97440d0523f7e4d0f7427408692cec7 SHA-256: 387be7b33cf961f7146ae76b57ae237e2ef9fdddc009f6a60a89ea03f459f7d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF file was flagged as malicious by multiple engines, including ClamAV with the signature 'Pdf.Exploit.Agent-36830'. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to exploit vulnerabilities. The ML classifier also strongly indicated maliciousness. The embedded URLs are related to XFA forms, which are known to be exploited in PDF attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
ecc63cbab7361b8a2a80015ed69c6360049d48ce447a7fec2b94eec7e4afb46f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42722 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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