Malicious PDF — malware analysis report

Static analysis result for SHA-256 361feb4f0d1cd42e…

MALICIOUS

PDF

42.7 KB
MD5: 9a6ba12441781e756362d47411a606ef SHA-1: d3d99f5c96b5a4cdb3827c076497408d8b2d04e8 SHA-256: 361feb4f0d1cd42e7e3e576d36a51bc5351f3f982a296a7dbf1d9a7924819b97
186 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically 'Pdf.Exploit.Agent-36830'. It contains embedded files and an embedded script payload, indicating it's designed to exploit vulnerabilities. The ML classifier also strongly indicates maliciousness. The primary IOC is the ClamAV detection name.

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 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://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 0xD7 46 bytes
embedded_file_obj0009.bin
48558b0fb0f1cc7ce67d3322d8164f1dd31414db5b2a5d1d311f564d595752f7		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 689 bytes
embedded_file_obj0010.bin
0fe7596619d7974f48bb0928a6efec8cf5bea691a6bfb71cb5fbc41c3ca73638		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x449 168 bytes
embedded_file_obj0011.bin
1649c98d388110a23221fc91f25e555d839b030ad98ca97609ac274343a4d80f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x53C 448 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x747 190 bytes
embedded_file_obj0014.bin
79f1c1274eed6c7b3e2f0787fc68ba4bc2d4d88482345a9f256993413c0d9826		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x852 40901 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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