Malicious PDF — malware analysis report

Static analysis result for SHA-256 1321e898bec7ff9e…

MALICIOUS

PDF

47.0 KB
MD5: 94f93180cf816c9e7c30cd4ecfdce0a8 SHA-1: 87a2aeec8e3ed89cfb5193deba8b15c415c8523b SHA-256: 1321e898bec7ff9ec38280c972a770ccd88bfa9c91d0a7668041507176adc505
176 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Agent-36830. It contains embedded content and XFA forms, which are common vectors for PDF exploits. The embedded file and exploit suggest it's designed to execute a secondary payload upon opening.

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
5cd35c6adbe84bf18434fe3a54cb7d741e534bf0e48cec963d6c4d5e88624666		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 47328 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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