Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fac27c57f93a44…

MALICIOUS

PDF

42.9 KB
MD5: e90dceda47698a696a81a472e0776df3 SHA-1: 1a3933a6e12776c692b1eb96eed1a00778a71a6b SHA-256: 75fac27c57f93a44a7886f70d5be4ac3e0b8a1d34b5d1f3d5db3b0a04c686892
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. The presence of embedded script payloads and XFA forms are common characteristics of such exploits. While specific URLs were benign, the core detection relies on the exploit signature.

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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
ec82fa4ec0326943962e1462bc26213a82192b796411c848fdc79cace317877b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43201 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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