Malicious PDF — malware analysis report

Static analysis result for SHA-256 8591a7181f492513…

MALICIOUS

PDF

94.1 KB
MD5: df7043dab242344180518aae19173dff SHA-1: cc34e50876538a0b6a3d411d55726ba9e83bdf1f SHA-256: 8591a7181f492513ad97be3b334024e185c9c0c14b18f88844cbf7a46633cc3d
168 Risk Score

Malware Insights

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

The PDF utilizes XFA forms and contains an embedded JavaScript payload. This script is heavily obfuscated but appears to be designed to download and execute a secondary stage. The ClamAV detections further confirm the malicious nature of the file, identifying it as a PDF exploit. The presence of XFA and embedded scripts points towards an attack vector commonly used for delivering malware via email attachments.

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
cf1ce6f27087f45f9a63d1429d84afb25f46be396e389dc5cf0b773c71f7d434		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95638 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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