Malicious PDF — malware analysis report

Static analysis result for SHA-256 1789412289dedf38…

MALICIOUS

PDF

93.6 KB
MD5: 4a6b27bddd4d5932e531fbeab4518b12 SHA-1: 12134ec6e615caca534e486aec4736b447e8b6db SHA-256: 1789412289dedf381e8d736e37be1f33da7bd975b71990e769f8a07f0866d17e
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 download and execute a second-stage payload, as indicated by the 'Pdf.Exploit.Agent' ClamAV detection. The embedded artifact 'embedded_pdf_script_00000246.bin' is the primary IOC. The use of XFA and embedded scripts points to a common exploit delivery technique.

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
253e9bfc40c76c754eafb73025bae2aad414f339b94e3d1458adca8480054993		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95094 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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