Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34e8ff906c252d7…

MALICIOUS

PDF

43.0 KB
MD5: 0626cb6395d2defef9f916af5bf2ed69 SHA-1: 059751ae47a13cbbadf3f7c0b05ed08d880b8b90 SHA-256: c34e8ff906c252d7da995fdc504fcd562b643a2dce87b20d8cf6d71c2017164c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as containing an embedded script payload and was identified as malicious by ClamAV with the signature 'Pdf.Exploit.Agent-36830'. The ML classifier also strongly indicated maliciousness. The embedded script likely serves to download and execute a second-stage payload, a common technique for initial access.

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
44b56e719dfb18a1f19d74388abbcdcce14e7518f98c7791411f7bcffe24ad4f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43269 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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