Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b52fefbd7b6ca57…

MALICIOUS

PDF

93.6 KB
MD5: 4d3e5ed452e64801af20cf7e6fcc61ff SHA-1: 04d128a0a505d15b27aca9f0d52fe0e5a219c7d3 SHA-256: 5b52fefbd7b6ca57376a9afa9b82463caf602d0a8831df38e7a013e58dc5f6ed
168 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript within an XFA form, a common technique for exploiting PDF vulnerabilities. The script is heavily obfuscated but appears to be designed to download and execute a secondary payload, indicated by the presence of script markers and the overall structure. The benign URLs present are likely decoys or part of the XFA template structure.

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
f80cfa6989ec284762ed39630b1e34bf7185ebbfecac155f7f54ae924b1a8f35		 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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