Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdad4e04e4da079…

MALICIOUS

PDF

100.5 KB
MD5: 081d929824b6daf175f415ab72e00b2e SHA-1: 4fcbb49ac97d933796d49366c1b7c020fa4f9e70 SHA-256: 7cdad4e04e4da07909f1e81c52a50cbdc06ffc8771ebb5be75142f42dca2acf3
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious PDF T1059.001 Command and Scripting Interpreter: PowerShell

The PDF utilizes XFA forms, a known vector for exploitation, and a high ML classifier score and ClamAV detection confirm its malicious nature. An embedded script payload was identified, strongly suggesting it's designed to download and execute a second-stage payload. The specific nature of the embedded script could not be fully determined due to obfuscation, but its presence in conjunction with XFA exploitation is a critical indicator of 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
afd724bad945ad1a168d874cbf269e88c2e89d0d18789b0b9ac061093ad9dfb0		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102156 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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