Malicious PDF — malware analysis report

Static analysis result for SHA-256 4692bec9f0491a56…

MALICIOUS

PDF

44.3 KB
MD5: dcfb1fc9c18d66ef44ec8f904aa273fa SHA-1: 5ec4c3573a0a371f152d5840a0886f7b775c7cfb SHA-256: 4692bec9f0491a56bd6bfece0de153b4491b555f4211e1a95249ca7fe3964cdb
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious exploit. The presence of embedded script payloads and embedded files strongly suggests it is designed to download and execute a second-stage payload. The ClamAV signature 'Pdf.Exploit.Agent-36830' is the primary IOC.

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 0xD5 46 bytes
embedded_file_obj0009.bin
58481460d0e5b9442c3b8f27ae56f7aa3969be756775de0d79c8d445a871b6f0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 689 bytes
embedded_file_obj0010.bin
69650a61091a018036679a3439cc6a018b6a91ebe9e0e3a6b36ceb04d6491a4f		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x449 160 bytes
embedded_file_obj0011.bin
c7004c62ea297ce2c22149d3c37f49c273d7d4c6f3f9b19d4967311032caceab		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x534 468 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x753 190 bytes
embedded_file_obj0014.bin
583ef0c1a510c03a85b814b8ea222622f551c18d3d37ea0f3621effd778ae166		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x85E 42522 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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