Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0161de6f3f54cf…

MALICIOUS

PDF

42.1 KB
MD5: ced828a31878b9a35626e024b60bf424 SHA-1: 86aceda815ae567c84d6d0f2f776a1950217e2b8 SHA-256: cd0161de6f3f54cfae637eb337437ed529789ee5390d8fcfc328d65a5e510821
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of an embedded script payload and an embedded file suggests an attempt to deliver a secondary exploit or malware. The embedded URLs are related to XFA forms, which are known to be exploited in PDF documents.

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/xci/1.0/
    • 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
4a7ed7d8d301a2880dfda01f5c0b85cf538061dc6eeabb3381b132b23b905d39		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42309 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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