Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73b74cb899b369a…

MALICIOUS

PDF

42.5 KB
MD5: 0a6fb1fdbeee54cf4100b775c48662d0 SHA-1: 1faa40a820ccf70cd18ceb174076f0ea998f031a SHA-256: b73b74cb899b369a15eb4539fb9fc32d6ec87f9eb594ada679e9277f60bddeb8
186 Risk Score

Malware Insights

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

The PDF file contains embedded script payloads and is flagged by multiple heuristics, including ML and ClamAV, as malicious. The embedded artifact 'embedded_file_obj0008.bin' is also detected as malicious by ClamAV. The presence of XFA forms and embedded files suggests an exploit delivery mechanism. The ML classifier output of 0.999995 strongly indicates malicious intent.

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
ff33f90e27c11a457d76f79872e2f2d8adb9b170cb7015561ebaa61d6b271296		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42743 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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