Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4255d479bd0d1a…

MALICIOUS

PDF

42.1 KB
MD5: e66128a714091d942654228cb9619464 SHA-1: 336fc48920be3000bb9e23d316b5fced622ede61 SHA-256: af4255d479bd0d1af9f48f80437bb3973cc063972a9b61cdeae446e7fad2b3a3
188 Risk Score

Malware Insights

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

The critical ClamAV detection of 'Pdf.Exploit.Agent-36830' strongly indicates this PDF is malicious. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic further confirms the presence of an embedded script designed to deliver a malicious payload. The ML classifier also flagged this PDF with a very high probability of being malicious. No document body text was available for analysis, but the embedded artifact and script firings point to a direct exploit 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 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
d436076855e24d229a2db098e23f26fb939fa50748eeb2947e88a4838ba54b43		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42346 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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