Malicious PDF — malware analysis report

Static analysis result for SHA-256 20afb9436dd0e4aa…

MALICIOUS

PDF

42.8 KB
MD5: 2d8f7d9007c7b39937acb2c93bb25934 SHA-1: ad9bfd2d0b02bf69efe135b10dc86846f2c9a531 SHA-256: 20afb9436dd0e4aa02020710db8a84b97744aa5e51e93b24f0e64f15721e0ab3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The presence of embedded files and scripts strongly suggests it's designed to exploit vulnerabilities and deliver a secondary payload. The ClamAV detection name 'Pdf.Exploit.Agent-36836' points to a known exploit targeting PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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 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/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
a7c8ca46525e147d62beb5dc989ab7c165d1a961319c35b2f30dda5ecb1b4eb3		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 687 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45C 93 bytes
embedded_file_obj0011.bin
7f7c8d13bab8c079a0cad89eef55fb35f31a0f63dcac1cc04798651def4e94fc		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x504 533 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x764 389 bytes
embedded_file_obj0014.bin
5b9a3f5ae0b0286190c28c5d81dae1d6319e192f97ee0ce8b8578906fa75246c		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x936 40622 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36836
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA82E 147 bytes

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