Malicious PDF — malware analysis report

Static analysis result for SHA-256 745f0863dca0fb30…

MALICIOUS

PDF

93.4 KB
MD5: 4e57383bbc0941e91905eebccd2c38c5 SHA-1: a67270317d126e515d9dff929acc0ba046edffc9 SHA-256: 745f0863dca0fb30e4bd41daab6fa443918c19deaceb5f9a57c7a7545d3052c2
168 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating the presence of an exploit. Embedded XFA forms and scripts are present, suggesting the exploitation of a client-side vulnerability. The embedded script, which appears to be JavaScript, is heavily obfuscated but likely attempts to download and execute a secondary payload, as indicated by the heuristic firings.

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
0a82e413b59be42ef8f775fef660f633d1e1c2f0cc2210b8ea7dc473348779b6		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94922 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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