Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac104b77fea7bf1…

MALICIOUS

PDF

42.4 KB
MD5: c6bee43a1db07fe0b042fae05cef5d05 SHA-1: 617abe39e71090b5b7a41073a843aa2d58bbeb3e SHA-256: aac104b77fea7bf196e16ce4d3ae2b93ed6bf8f41c99af503347aa235d3088fa
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating it contains malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest the presence of an exploit. The embedded file and script payload further support this, pointing towards a delivery mechanism for a secondary exploit or payload. The specific ClamAV detection name 'Pdf.Exploit.Agent-36830' is included as a primary IOC.

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
5865d62e6d9e2b380dad8b70f53e6e47e33d0af45ae65251b09d1297ca31f5f7		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42709 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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