Malicious PDF — malware analysis report

Static analysis result for SHA-256 d260575a3e9efff0…

MALICIOUS

PDF

82.9 KB
MD5: 98b45deb57889d3ab7902ad8e99e61dd SHA-1: 49715d3fa1d29b43b81d0328462c02ba252d800f SHA-256: d260575a3e9efff0c1688c667dd1564db4ac4ace047b05e64ae228684318077b
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1059.007 Command and Scripting Interpreter: JavaScript

The PDF utilizes XFA forms and contains an embedded script payload, as indicated by multiple high-severity heuristics and ClamAV detections. The ML classifier strongly flags this PDF as malicious. The embedded script is likely responsible for executing the malicious payload, although its specific actions are not detailed in the provided evidence. The presence of XFA suggests an exploit targeting PDF rendering engines.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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 script payload in PDF stream medium 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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_pdf_script_00000246.bin
f47bfdc8e37a0b66fbc0f7885f27df5f7e70c4da644b998e18acc29754011896		 pdf-embedded-script PDF raw stream script payload at offset 0x246 84197 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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