Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef17681b1084c70…

MALICIOUS

PDF

42.1 KB
MD5: 81a0711639829a623bd03b10ffad48be SHA-1: 7fca0170de9c9072e10db3daaad57153b03ce2e0 SHA-256: 0ef17681b1084c703f18e1cb725a655b6dcf433f5e26d8f9b339f9314bbaf340
176 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains an embedded script payload and an embedded file, indicating it's designed to execute malicious code upon opening. The ClamAV detection 'Pdf.Exploit.Agent-36830' suggests it exploits a known PDF vulnerability.

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
695dc8803f98e3b465aaee3d25ac18d5eb3e83edeb6b1f90e81ddb394631b033		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42406 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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