Malicious PDF — malware analysis report

Static analysis result for SHA-256 98696c3f43c0347d…

MALICIOUS

PDF

42.4 KB
MD5: 18029901380454cf95bcdc5da07ffedb SHA-1: 552763124e708b4ae661715648a892a740b6aec6 SHA-256: 98696c3f43c0347da46f046c2589612a01876999a7885f869d8a2f2851d2f49d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF exhibits multiple indicators of maliciousness, including embedded script payloads and a high ML classifier score. ClamAV detection as 'Pdf.Exploit.Agent-36830' strongly suggests it's an exploit-based document. The embedded script, though obfuscated, likely facilitates the download and execution of a second-stage payload, a common tactic for PDF-based malware delivery. The presence of XFA form elements and embedded files further supports its role as a malicious document.

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
7efb65b32de5524615ff1f53f2c77f08e8280e295a697cfbbb751c6e2f10467b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42619 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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