Malicious PDF — malware analysis report

Static analysis result for SHA-256 35287873dca4d867…

MALICIOUS

PDF

100.5 KB
MD5: f0ce58e3be212ba0517582795a4d2c06 SHA-1: 116e4875bdce5f0c4c6a88af288f88c7ec48e012 SHA-256: 35287873dca4d8674efb54574b3ea1a89d44fcf8d067e0368e01575e4da7e321
178 Risk Score

Malware Insights

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

The PDF utilizes XFA forms and contains an embedded script payload, as indicated by multiple heuristic firings including critical ClamAV detections. The ML classifier also strongly flagged this PDF as malicious. The embedded script is likely responsible for delivering the malicious payload, although its exact function cannot be determined without further analysis of the extracted artifact.

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
c0d1e1cf03162829718f9955179d5bd76b0fc006db8430a35d440de723ed8ed5		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102154 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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