Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a677c4a651d9e64…

MALICIOUS

PDF

42.5 KB
MD5: d90e7d02d381dc45f1478a124619c721 SHA-1: c58663ac576e32e9e703efd0c6b3e883f7f1b17f SHA-256: 7a677c4a651d9e64186b78cb44b8c3a22402da3b2b3fc2895c02ce3f7f4ac22e
176 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating it contains an exploit. The presence of embedded script content and an embedded file further supports this. The script, though obfuscated, appears to be JavaScript and likely attempts to download and execute a secondary payload, as suggested by the 'embedded_file_obj0008.bin' artifact and the ClamAV detection name 'Pdf.Exploit.Agent-36830'.

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
ebdc9229c32f7a618de2ba36f6036d17e6e8897d8ffa7e8f378bb2a4fccfe47a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42722 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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