Malicious PDF — malware analysis report

Static analysis result for SHA-256 13be9c3c9ce33c17…

MALICIOUS

PDF

42.8 KB
MD5: af4b721c4bff6931672d0404f7df85f0 SHA-1: dfb7f193d446b0ce28557195fc138998c9fa2bd5 SHA-256: 13be9c3c9ce33c17b98f0eeb8fc91ad6c78cd90784ec268f114775122bc4d6f5
178 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded scripts and is flagged by multiple heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36836'. The presence of an embedded file object, 'embedded_file_obj0014.bin', suggests it's designed to deliver a secondary payload. The XFA form structure and embedded script indicate exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-36836 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36836
  • 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 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 script payload in PDF stream low 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 67 bytes
embedded_file_obj0009.bin
425aa3a7624fabf0089a7c06a3ed5e0137648fae532758b21845d9cef157e824		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 681 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x456 93 bytes
embedded_file_obj0011.bin
57c2449bdd83767702dcf72c5e81c495fdea217d6c3efb7cf8af17e6c3a8a4bd		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4FE 486 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x72F 389 bytes
embedded_file_obj0014.bin
8d0becec6ff9029010fcb6a5069b988b1bdecd7d479acd9889064fd3fcb6c77e		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x901 40736 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA86B 147 bytes

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