Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69bc3bbfb4c81f7…

MALICIOUS

PDF

42.9 KB
MD5: e3ce174c1a9334bcd8cdbb6cddbd7b10 SHA-1: 866725b9c5193cae6ed32335676126d6dfc94699 SHA-256: c69bc3bbfb4c81f766c03af363bd96b88d3cb31179eb1d2c3b2e22de2583fa55
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is a PDF with embedded content and scripts, flagged by multiple heuristics including ML and ClamAV as malicious. The embedded script payload and ML classifier output strongly indicate exploit activity. The presence of XFA forms and embedded files are common delivery mechanisms for PDF-based exploits.

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 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.
  • 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 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
9daa438d3f2667876fcc902de50fb0d5f3548ead2e918dfbc067884eb861cf07		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43134 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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