Malicious PDF — malware analysis report

Static analysis result for SHA-256 d161135302f49780…

MALICIOUS

PDF

79.1 KB
MD5: 173496f266fa03e97077eabb6c129881 SHA-1: 0c52b0c071aebbc97d34c9d51514eb53d69c9a64 SHA-256: d161135302f49780d4107124706861f55bbc98b7ffa9cb00f8f357d9fa3d99f0
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter

The PDF was flagged by multiple high-confidence heuristics, including ClamAV detections for 'Pdf.Exploit.Agent-6136306-0' and an extracted artifact 'Js.Exploit.HTML-29'. The presence of an XFA form and an embedded script payload indicates an attempt to execute malicious code upon opening. The ML classifier also returned a very high probability of maliciousness.

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_0000023c.bin
31703c736d95ba0b7313cbc7d79f25fc909c9ff0e0adced6f209a296d7e26b56		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80283 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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