Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cb3c7e043f2d66…

MALICIOUS

PDF

79.4 KB
MD5: 30a23d9c11fcee8b5fc9265c39e25ded SHA-1: 443e15d703ef9674c1902849bac6b68217bb3809 SHA-256: 13cb3c7e043f2d66ccba14ea8b40131912ad9049fe4e3cc3d5dd221e23b64b77
168 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript payload within an XFA form, which is a common technique for exploiting PDF vulnerabilities. The script is heavily obfuscated but appears designed to download and execute a second-stage payload, as indicated by the 'Js.Exploit.HTML-29' detection on an extracted artifact. The specific exploit and payload are not fully discernible due to obfuscation and truncation.

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.
  • 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_pdf_script_0000023c.bin
9ed6e10dacdafe3b984bfe5e1c72d6ed05fac24496d20eb7bd02c6063d0a9898		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80543 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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