Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611b358adf176cd…

MALICIOUS

PDF

94.1 KB
MD5: a2b20d5ddac9cf8df8a58f73e7d45837 SHA-1: a643c4554b295a420daaff8293435ed4fabeb762 SHA-256: f611b358adf176cd841493a34e6e08e4034db3dbf73244f2daf365768cd8034b
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains an XFA form and an embedded script payload, flagged by multiple high-confidence heuristics and ClamAV detections. The ML classifier also strongly indicates maliciousness. While the embedded script's exact function is not detailed, its presence within an XFA form suggests it's used to download and execute a second-stage payload. The embedded URLs are not directly actionable for malicious intent.

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
0035aabaae52ee3422da0d22cbb83724d8d845a8414a4a6863d6802590351927		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95638 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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