Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e2c265784efc37…

MALICIOUS

PDF

100.4 KB
MD5: 5113258d30acc9086de8f95a3beb09f1 SHA-1: 97f801e4106f107e23b680fb8517edb62bc3bb93 SHA-256: 73e2c265784efc376ba6307c41e87470362bd5e814a046088b3933ee4eea8555
168 Risk Score

Malware Insights

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

The PDF utilizes XFA (XML Forms Architecture) and contains an embedded JavaScript payload. This script is designed to execute malicious code, as indicated by the ML classifier and ClamAV detections. The script's obfuscated nature and the presence of embedded exploit code suggest it's intended to download and execute a further stage, typical of a downloader or dropper malware.

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
4f451baaf5b5e8af35f72401ad3688b37a7c8b8a3cbb5015d2a12d5982bdcc2b		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102042 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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