Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1e7fc1615e4cef…

MALICIOUS

PDF

93.5 KB
MD5: 51a903525184840c50857526467c7b83 SHA-1: d47c67b709a5fd518ab309f5453246a056347013 SHA-256: 6b1e7fc1615e4cef0ac2807fb087f45be36890ed08e4d08963c36ae89b622a1e
168 Risk Score

Malware Insights

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

The PDF sample contains an XFA form and an embedded JavaScript payload. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary stage. ClamAV detections further confirm the malicious nature of the file, identifying it as a known exploit agent.

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
e3f28c7e5b9f41e5908cbf65ced31a8db429ac5a4b6fcf696cd96664c094eed3		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94992 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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