Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc461ff4484561ef…

MALICIOUS

PDF

42.2 KB
MD5: 3616d4863ac7664ac0bfdb676e6a9401 SHA-1: d009ea8da837e5a40f77f79d6ac31681143ed59d SHA-256: cc461ff4484561ef4034dfcbcb9a15dac26f49e510edcacb108b1894dc5cf7cc
186 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple high-confidence heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830). The presence of an embedded script payload and an embedded file strongly suggests it is designed to deliver and execute further malicious content. The XFA form structure is also noted, which can sometimes be leveraged for 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
4ae5ffe0bf0b3d6a61acd11ceb35dabd6ef6de5ad9a5a6b612d13a2c51f399d8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42448 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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