Malicious PDF — malware analysis report

Static analysis result for SHA-256 07caa55acc19b4b3…

MALICIOUS

PDF

94.1 KB
MD5: f4465a468c62fcba85957285bd352d68 SHA-1: 937742aefb64ff9fa62414e71f2450224589a1dd SHA-256: 07caa55acc19b4b351394a854396238f0cac9720b5d774a7f4a4bf163db7d418
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 embedded JavaScript, as indicated by multiple heuristic firings and the presence of a script artifact. The ML classifier and ClamAV detections strongly suggest malicious intent, likely for executing a secondary payload. The embedded script, though truncated, shows signs of obfuscation and attempts to construct executable code, consistent with a downloader or exploit execution pattern.

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
19f1d815f0ba7764a80973beb28aea0e3c1feaa1aeeae2668357c3d33346c02f		 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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