Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5cafa3a31979c2…

MALICIOUS

PDF

94.1 KB
MD5: 9bb3ea78ef5e42f5be3bc817ce052de9 SHA-1: abff0a5d6ef4f705736741774de8eaea60684ba8 SHA-256: cd5cafa3a31979c2a0973aefd1d48ae5bb4af78d61aeebf1aeecf1b76d5052aa
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF utilizes XFA forms, a known vector for exploitation. Heuristics indicate an embedded script payload and ML classifiers confirm maliciousness. ClamAV detections further support this, identifying it as Pdf.Exploit.Agent. The embedded script is likely responsible for delivering the secondary payload, though its exact function cannot be determined due to obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • 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_pdf_script_00000246.bin
c3ce4d02abd097d68bfa9b2ed08c398c6d940a5370e0857c58aaae6becf47edf		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95638 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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