Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d705b2c638f5dc…

MALICIOUS

PDF

93.2 KB
MD5: a45b7ac912b6ccf062bbffde5e64b2a7 SHA-1: e4100720b6d1eb212f1caa63325dbc5b230f99a1 SHA-256: f3d705b2c638f5dc22cd806fabcea1d266f37b028974cdd90b3cc98992c63f43
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple high-confidence heuristics, including ClamAV detections for 'Pdf.Exploit.Agent-6136306-0' and an extracted artifact also detected by ClamAV. The presence of an XFA form and an embedded script payload strongly suggests exploitation. The ML classifier output of 0.999992 further supports the malicious nature of the file. The embedded script is likely responsible for executing the exploit and delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • 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_pdf_script_00000246.bin
4bcec20db56bac678c64dba5fedc61fc6af6bb108425c18e60442a06acf968c0		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94714 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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