Malicious PDF — malware analysis report

Static analysis result for SHA-256 18557f5509fd2844…

MALICIOUS

PDF

100.4 KB
MD5: 20f81d1ad5f9ec92ab9ca9e2cd7530c4 SHA-1: a82b2ea1a0350a540614bdaabdc5b5286f18ebfb SHA-256: 18557f5509fd284458068c4aa94f04081e89b1fa1810fd646c422fb1d9abfd7e
168 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV and a machine learning classifier. It contains an embedded JavaScript payload within an XFA form, a known technique for exploiting PDF vulnerabilities. The script is heavily obfuscated but appears designed to download and execute a secondary payload, indicated by the 'embedded_pdf_script_00000246.bin' artifact and the 'ML_NYX_PDF_MALICIOUS' heuristic.

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
3b691d2e652719d8350ebd547183d2ffd3b0dd10a6722dcd2e048f194f592329		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102042 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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