Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1caf7b4b1876512…

MALICIOUS

PDF

79.3 KB
MD5: f116d0480e0191d75211a4f555ae2698 SHA-1: 13bae4daee99c9f5a642c3b582e177d1b657b4e9 SHA-256: d1caf7b4b1876512d5ec9873b190c262b0893d9c5be6199e940e30c57113a3ed
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious PDF T1566.002 Phishing: Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, with critical heuristics indicating an embedded script payload within an XFA form. The presence of XFA suggests an attempt to leverage form functionality for exploitation. While no specific family is identified, the combination of PDF, XFA, and embedded scripts points to a common delivery method for malware. No scripts were extracted for detailed analysis, limiting the ability to determine the exact payload delivery mechanism.

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_0000023e.bin
c4a999ff596c383fe2b4eff1d89f960acb0788ec9dfdba11516cd399b9d477f8		 pdf-embedded-script PDF raw stream script payload at offset 0x23E 80467 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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