Malicious PDF — malware analysis report

Static analysis result for SHA-256 6531ce7ccfb8e321…

MALICIOUS

PDF

42.8 KB
MD5: 1b22e9cfd05870c9efafcb6e85df2fe7 SHA-1: 7d35317758f8888ca335b76cccbddf3996bc98ef SHA-256: 6531ce7ccfb8e32188b9d71a2ca1b6f4a8c21ba521dd9e463631395e0fa0f946
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 malicious intent. The presence of XFA forms and embedded script payloads suggests an exploit designed to execute arbitrary code, likely leveraging JavaScript within the PDF structure. The embedded artifact 'embedded_file_obj0008.bin' is also flagged by ClamAV with the same detection name.

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
5348b52bc1621544aa7fd04a616f976f89b723d54c0f512f4f1a136b39a0df02		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43054 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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