Malicious PDF — malware analysis report

Static analysis result for SHA-256 1099f9bae2a3f3bf…

MALICIOUS

PDF

42.4 KB
MD5: 53712073b4ae077d75ed331508a4d861 SHA-1: 189a10ee18d414f3feeb2e84af7629e15d048458 SHA-256: 1099f9bae2a3f3bf3c4b7846fddcbb82d8d9c33c40f0d0098f4052575e31eb89
176 Risk Score

Malware Insights

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

The PDF document contains embedded XFA forms and a script payload, indicating an attempt to exploit a PDF vulnerability for client execution. ClamAV detection as 'Pdf.Exploit.Agent-36830' strongly suggests malicious intent. The embedded script, though obfuscated, likely attempts to download and execute a second-stage payload.

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
a34e1d1058db5e011582d5adac8cd04ade4f19b23d894b6766bada8846b26ec4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42710 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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