Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b4ddbf5ddecade…

MALICIOUS

PDF

42.9 KB
MD5: cca7a45291c947008a28bcd633b79f8c SHA-1: 6cc8dc7814e1b4afd2f9ad2be62708bdae3f2a1b SHA-256: c7b4ddbf5ddecade90178dd0c674919e30ed010f1604c1f15f9d77ddb414010b
186 Risk Score

Malware Insights

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

The critical ClamAV detection and ML classifier strongly indicate malicious intent. The PDF contains embedded scripts and files, suggesting it's designed to exploit vulnerabilities and deliver a secondary payload. The embedded artifact 'embedded_file_obj0014.bin' is particularly large, likely containing the main exploit or payload.

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
d8bf209df925551dd0aa4b42a34d338da57307fd294744be28d8a5f1aa878d1f		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 683 bytes
embedded_file_obj0010.bin
e1ab66598406464785df1b7c3e4218452dce39c816aca3e1a181e312cbe8a05c		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x458 93 bytes
embedded_file_obj0011.bin
c4ea613149f7c60c77dcef6df38cba9786d4f2a29735ff6aa2fd7b5bd56026e4		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x500 405 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6E0 389 bytes
embedded_file_obj0014.bin
4003d88b82f122f80d65736e47188062f110248c216246eb25c432acbc14e123		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8B2 40887 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 0xA8B3 147 bytes

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