Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfed69dddcb955d4…

MALICIOUS

PDF

79.1 KB
MD5: f51d41d86100c22638a0fddad664f9c5 SHA-1: 595a25269c9faa26ab3355ae7ce6a05e66fbb4a7 SHA-256: cfed69dddcb955d4220f99e1728cb59e2281f7120bf5774ee34e71e65356016f
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 contains an embedded script payload, flagged by heuristics and ClamAV as a malicious exploit. The ML classifier also strongly indicated maliciousness. The embedded artifact 'embedded_pdf_script_0000023c.bin' was detected by ClamAV with the signature 'Js.Exploit.HTML-29', suggesting it's a JavaScript-based exploit. The XFA form structure is also noted.

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
08379d0a3e2f88164bbc75bb80e09df760eef23c3c1d2a6605065f1f951b9189		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80285 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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