Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdd6cd940d50ca2…

MALICIOUS

PDF

42.8 KB
MD5: 293288e992ec7be124148a9084513152 SHA-1: 6687b39a6a1edaafcb71aef959e381440324e25b SHA-256: ffdd6cd940d50ca2accd0fad7c4aa15d746dbb1ea0be61d92984b7bcfaff8d92
188 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple high-confidence heuristics, including ML classification and ClamAV detection. The PDF contains embedded content and XFA forms, which are common vectors for exploitation. While no specific script was directly readable, the presence of embedded artifacts and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the PDF is designed to exploit vulnerabilities and deliver a secondary payload.

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
d669d844abe3663ed0920707df8cc025616d39c1ee33ce5d8b31ba913d9d6327		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43102 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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