Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a156aeb6c31b6c…

MALICIOUS

PDF

42.5 KB
MD5: 3039983dd4283f9df6161da9a25d0439 SHA-1: 80529c05f9c80b765410646f70e285c418c398f5 SHA-256: b4a156aeb6c31b6cc837edb0063d5955b25769f93bf9d3b5d0cb4ddda03d5c4d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The sample is a PDF file flagged by multiple heuristics as malicious, including embedded script payloads and ML classification. ClamAV detection of 'Pdf.Exploit.Agent-36830' indicates it's a known exploit. The embedded script, though obfuscated, likely contributes to the delivery of the malicious payload.

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
f8f247d58e83a2bf111381398fa401cecf1925f5b26ad15b787567eef7badd53		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42733 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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