Malicious PDF — malware analysis report

Static analysis result for SHA-256 8398b4345beadb28…

MALICIOUS

PDF

42.9 KB
MD5: 2b3ff07a38b976bb075e8dcd04c7e51e SHA-1: f0f0e717eae453e8b1ab378a10868ae92edccb2c SHA-256: 8398b4345beadb281bd2d73a5cf0017ab32cf8a5ed512383a4035f13ca977148
188 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV detection, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports this. While the document body is obfuscated, the overall structure and heuristic firings point to a malicious PDF designed to deliver a secondary 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
aae66f740b921526f3789da138ca588b83b99506f16517b06ca7d411d3391fc3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43217 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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