Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f43c9e340c0c9cb…

MALICIOUS

PDF

42.5 KB
MD5: 426c90ef0a804f91e12a6107d7c83d53 SHA-1: 84d71eaa83d45e3909eda75a7bd740c3ec15f71a SHA-256: 5f43c9e340c0c9cb3fbbd394e1d98074c785e4567af0c9e1add759a230127a1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a malicious PDF identified by ML classifiers and ClamAV as Pdf.Exploit.Agent-36830. It contains embedded script content and is flagged for XFA forms, indicating an exploit attempt. The embedded script likely downloads and executes a second-stage payload, a common technique for PDF-based malware delivery.

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
c827341d10ddc950309907b7c577e48b71a508e16576399b8f7d566d99ab2e52		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42738 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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