Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdc94f1887fd039…

MALICIOUS

PDF

43.2 KB
MD5: 36ad50d09f4e4ec08d6f10bddf415529 SHA-1: 623ab463f23211300b6ce2080eb575c547be6abe SHA-256: 6cdc94f1887fd039d14146385a2eff650ae02c5a9125b4e184a6ee6588e0594b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a ClamAV signature (Pdf.Exploit.Agent-36830). It contains embedded content and XFA forms, which are common vectors for PDF exploits. The ML classifier also strongly indicates maliciousness. The embedded artifact suggests a secondary payload is likely delivered.

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 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 script payload in PDF stream low 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 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
79551fc3e42b6f8ca04838f5547b10cd23617018fa9b9b430c9c837bb84f8908		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43456 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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