Malicious PDF — malware analysis report

Static analysis result for SHA-256 1601fed13bb6604b…

MALICIOUS

PDF

42.0 KB
MD5: e9df35a4fb8fd169a8598b37aba19173 SHA-1: 55e939c4029c406b60cdc2d8bedba3dcbe9dfb87 SHA-256: 1601fed13bb6604b9f0fe41cd8b22541016900dfb97de87643e7fa34c6efc28d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating it contains an exploit. Heuristics confirm the presence of embedded files and scripts within the PDF structure, suggesting it's designed to deliver a secondary payload. The benign URLs present do not detract from the malicious nature indicated by the exploit detection.

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 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 script payload in PDF stream low 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 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
5b53f57a6c4eb96d85f2ad8a56fb463c1dfefd855fee728c2c619273a89e456d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42276 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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