Malicious PDF — malware analysis report

Static analysis result for SHA-256 777c3c2e84631ea6…

MALICIOUS

PDF

93.3 KB
MD5: 9204e36d4995848b9262b715ea02fa24 SHA-1: 25af911bc876ab0182a375bf27f99ad777fc0b84 SHA-256: 777c3c2e84631ea69a30543551bb5a5c47cb48c9c07b3d71cf7bc3447ad91451
168 Risk Score

Malware Insights

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

The PDF contains an embedded XFA form with JavaScript, flagged by multiple heuristics as malicious. The embedded script, though truncated, appears to be obfuscated and attempts to construct a payload. ClamAV detections further confirm its malicious nature, identifying it as Pdf.Exploit.Agent. The primary IOC is the embedded script file itself.

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
7d0735cfeca8a70c2c2126c1caafa6a7d3e411ba4020605f1ddc0059480c1281		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94820 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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