Malicious PDF — malware analysis report

Static analysis result for SHA-256 835aabc36eb16fea…

MALICIOUS

PDF

79.4 KB
MD5: c9e1050eed0c10dba143ab228143f072 SHA-1: 8328263201451376fafb47d0ec1896b31c1ad848 SHA-256: 835aabc36eb16fea6bd7dc88ddc84bcbb91a1470b0b4c6c257ce9c4a0656625a
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains an embedded script payload, flagged by multiple heuristics including ML and ClamAV. The embedded script is likely responsible for delivering a secondary payload, as indicated by the ClamAV detection of 'Js.Exploit.HTML-29' on an extracted artifact. The XFA form structure is also noted, which can be a vector for exploitation.

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_0000023c.bin
5a9c36c1e6d96ab30ad3910bd318ab5b3992d2ee884ce079ca3406b82ac731fd		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80631 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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