Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa331c12c22d6f5…

MALICIOUS

PDF

42.4 KB
MD5: e3abc47db1fc43fb01d2b82e86f01b67 SHA-1: 9cd4913c273f252be45f3f06781c83b63ecc5bdc SHA-256: faa331c12c22d6f5eb96b80aa332582597f5ed1c244d89d5fcdd8a3bc2b9da09
188 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file indicates the document is designed to exploit a vulnerability and deliver a secondary malicious artifact. The embedded URLs are related to XFA forms, which are known to be a vector for PDF exploits.

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
6f0b0f3d004905060dbb11fcd74c1259f9c256bdd2fa357fb9a51287a40982c5		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42680 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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