Malicious PDF — malware analysis report

Static analysis result for SHA-256 937972fb10e48c35…

MALICIOUS

PDF

42.8 KB
MD5: b4d883906fc5fa575058551c838d57ad SHA-1: 2c8b1bd131c1e2804d1f11e9cb18edd40a600f6e SHA-256: 937972fb10e48c35279cccb284ffcaa66a76e3dc685c848aeab2ad0a3d0a00bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious exploit. The presence of embedded files and scripts, along with the ClamAV signature 'Pdf.Exploit.Agent-36836', strongly suggests it's designed to deliver a secondary payload. The document body content appears to be obfuscated script fragments rather than user-readable text.

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
6beb9c73e5d95a9eba80adfa78d8b11cd7c91323bb3b09c9f9d3f10e3a29becf		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x504 536 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x767 389 bytes
embedded_file_obj0014.bin
fdddb3df035839f3d1696ac47e234b6e00ab9167abc675bd94b389e164fbc30b		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x939 40621 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 0xA830 147 bytes

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