Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e7c3f6fcda17e5…

MALICIOUS

PDF

42.9 KB
MD5: cd8ef5512a5aa1163fe2ca24e8956a24 SHA-1: 6de0be9f816f1769520128a3863cca563d3eccb5 SHA-256: 52e7c3f6fcda17e5df7854d30929e2156e561753bb2577517c40e5437c0474df
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36836, and a machine learning classifier also flagged it with high confidence. The PDF structure contains embedded files and scripts, indicating it's designed to exploit vulnerabilities and deliver a secondary payload. The presence of embedded script payloads and the ClamAV detection strongly suggest an exploit delivery mechanism.

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
27087181e6fb022f4da23dc94cdd191792a0d3249c7d89bea77bdfb0c30a6efa		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 691 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x460 93 bytes
embedded_file_obj0011.bin
82f5143715233e7b952526ef028533575a524c6c0569c25e9dcf3a6b26b02988		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x508 518 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x759 389 bytes
embedded_file_obj0014.bin
7e81eb3836305ecd9e4743a2d435468fa08f7c68d90ecd0d376d12db4f19c3c8		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x92B 40743 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 0xA89C 147 bytes

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