Malicious PDF — malware analysis report

Static analysis result for SHA-256 148f00c3ddba31f1…

MALICIOUS

PDF

93.4 KB
MD5: 5f44984a42e5bf2bc9504e094bcf138b SHA-1: 6faa74ed136430b4e4fdc5b15c4720e17e9de880 SHA-256: 148f00c3ddba31f1d7c17c431bd9b522b2ce6fd52802a9cff76530398aa1ab6f
168 Risk Score

Malware Insights

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

The file is a PDF with XFA form elements and an embedded JavaScript payload, flagged by multiple heuristics and ClamAV as malicious. The embedded script is heavily obfuscated but appears to be designed to execute code, likely downloading a second-stage payload. The presence of XFA and embedded scripts points to a common exploit delivery technique.

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
cff78afec52ce0c532e07b08f09560a9673f0be7d7b4fd4ba03d89dff2ec6e7b		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94924 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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