Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cbe1ce9e6c6c43…

MALICIOUS

PDF

42.6 KB
MD5: 2bf3eda2e209843e4b0e9a5768689652 SHA-1: 58230f39b52e23c291ad22fa4a4effef5fcd074c SHA-256: 37cbe1ce9e6c6c432d9044d4f33d964e5fc6964e10c591dc616f770c3c2f359d
188 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of an embedded script payload and an embedded file suggests it is designed to deliver further malware. The document body contains obfuscated JavaScript, which likely attempts to exploit a PDF vulnerability.

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
909fffd086d3665e6e8f954ea9f4496573986fc6f9cdd5b1837e1d8d988e6c27		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42833 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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