Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce3c0fdb22903d3…

MALICIOUS

PDF

93.4 KB
MD5: d32f5dece760790d77354b26ed06cefa SHA-1: 192942f7ae05b3ddb6041f77089e9305a1b56404 SHA-256: 6ce3c0fdb22903d35f791a3926ad9a499526926c71975632f4c39bd3d3cc8b29
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by multiple engines, including ClamAV, and exhibits XFA form usage with embedded JavaScript. The embedded script is heavily obfuscated but appears to be designed to download and execute a secondary payload, indicated by the heuristic firings and the nature of XFA exploits. The specific JavaScript payload could not be fully deobfuscated, leading to a slightly reduced confidence in family attribution.

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_00000246.bin
efaa3d89fc1cec398cd0d2731a757869b24f6dd2425890bf5d900fa57c7bedc1		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94920 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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