Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab41998aec671a3b…

MALICIOUS

PDF

93.4 KB
MD5: b85a9e2767f14da0a87a6e77fcd9e9db SHA-1: 6bc9bcd637f7bc8dbbec2dfd83ecf95396d503b8 SHA-256: ab41998aec671a3b8c542915326e779d7ceddac4a9f034ea424b04390c5fa88d
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File

The PDF utilizes XFA forms, a known vector for exploitation. High-confidence heuristics and ClamAV detections confirm its malicious nature. An embedded script payload was also identified, strongly suggesting it's designed to download and execute a second-stage payload. The specific exploit and payload are not detailed in the provided evidence, leading to an 'unknown family' classification.

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
2dfb8c1169c4b6b85bd188f7c370004b7d32f6417d871e4fadc6a8a8a83af83a		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94922 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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