Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a185ddaa60802d…

MALICIOUS

PDF

43.1 KB
MD5: a5e5ab617607cfafd6c2d35a680c336c SHA-1: 6770ac5eafe73145390117e2d3dc5d08ace24425 SHA-256: c4a185ddaa60802d8d2daff222b5f161b571168b9a4e56046e15643be351f293
186 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830). It contains embedded files and scripts, indicating it's designed to deliver a secondary payload. The presence of embedded script payloads and the ClamAV detection strongly suggest an exploit attempt.

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
35ef41bcafed46104713ca03e45e736ea0e7afda1b3bfa33369ccd0f3bd943c4		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 687 bytes
embedded_file_obj0010.bin
0fe7596619d7974f48bb0928a6efec8cf5bea691a6bfb71cb5fbc41c3ca73638		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x447 168 bytes
embedded_file_obj0011.bin
bd52e99e5fb70fe4ade52b80fcfb0dc1953ec932a72201c10c567d08bb543110		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x53A 431 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x734 190 bytes
embedded_file_obj0014.bin
f5ade82df23d88eb53200a5b7f22f4253fb6a07507b0e2ae8cb2c0814bb70a5a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x83F 41359 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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