Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c849d5dc6d99c7a…

MALICIOUS

PDF

42.3 KB
MD5: 8c9835ce28ba22501360bde9d7000fb0 SHA-1: cdbb2c4acbd0f580ef7562bab221c3c0da2c6d8b SHA-256: 6c849d5dc6d99c7a33a54211bfa79c4a2571cefe572aedbd4c121f1c84572f2d
176 Risk Score

Malware Insights

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

The file is identified as malicious by multiple high-confidence heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830). The presence of PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD indicates that the PDF is designed to execute embedded scripts, a common technique for exploiting client-side vulnerabilities. While no specific URLs were flagged as malicious, the embedded script payload is the primary indicator of malicious activity, likely serving to download and execute further stages.

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
a8d780fa47c899c7e4edb985d090d1052caa8fd79b5148fede0c3b27fa5892f1		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42582 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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