Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cc7c444f6cd25b…

MALICIOUS

PDF

42.5 KB
MD5: da1c96056ee5e86c7b9d755e35e98199 SHA-1: 938b1aa716417f45054c580cc8d5004d944f1a98 SHA-256: 77cc7c444f6cd25b50339078984d1708fa25c6dea0fdac0d85a7a714e5d10efc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded script content and was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The embedded script, likely JavaScript given the PDF context, is designed to exploit a vulnerability for client execution. The embedded file artifact is also a strong indicator of malicious intent.

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
15981fe3a6a46d7f8786c99792fa8800babc70182b333eb5e7e0da4840d9916f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42780 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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