Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdb486805834a9d…

MALICIOUS

PDF

42.4 KB
MD5: 73ad415591fc5fa176ee6d07d8ce753f SHA-1: 79b568b8b87047dfe4beacc8cbb44da0b539f14b SHA-256: 6bdb486805834a9d7014996b8891f1e2d2e1b6ebf859b60d5fb8cf3401c68ced
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically indicating an exploit. The presence of XFA forms and embedded script payloads suggests an attempt to execute code within the PDF viewer. While the specific exploit is not detailed, the ML classifier and ClamAV detection strongly indicate exploitation for client execution, likely involving JavaScript.

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
32c4eb77c2abafe256d1c375520440605c99f7f1ad602f5a897611b878643764		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42698 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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