Malicious PDF — malware analysis report

Static analysis result for SHA-256 12423308c5190c98…

MALICIOUS

PDF

42.5 KB
MD5: 952fa9af52c8f580cd8c6a8f3c2bfe16 SHA-1: 649a955447cec256b3fa3fad1ac7f8965e5a838b SHA-256: 12423308c5190c9875ba1e2a7b1b5d889d1e783cbff54ddddde05f18d3905a9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded scripts and is flagged by multiple heuristics, including ClamAV detection for Pdf.Exploit.Agent-36830. The ML classifier also strongly indicates maliciousness. These factors suggest the PDF is designed to exploit a vulnerability for client execution, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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.
  • 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://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 46 bytes
embedded_file_obj0009.bin
3ece9fa4ca0271846bd6318e0457a20bb29cd7e5656e0213457ca33c6456794f		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x13C 687 bytes
embedded_file_obj0010.bin
8259db878f85521b2ee9c7ec108d34b19d3b6c900af7d501b5135c2cd3dcfde6		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x436 168 bytes
embedded_file_obj0011.bin
a3585b965a1e3366ec174bb0b8f664f2ac827e122fdd0bd6136570083eb94b9b		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x529 441 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x72D 190 bytes
embedded_file_obj0014.bin
1d4a6b8229e1c8ba7221ebdd2a86171c69f2673814ad2ce49fd6255622fc297b		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x838 40699 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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