Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e889c540eb9249f…

MALICIOUS

PDF

94.0 KB
MD5: a012b281a0917e5268458bc6c0a5ccb5 SHA-1: f0433e27f37673af372fbe7960171b2677e79e33 SHA-256: 0e889c540eb9249fe6f39f358afa8c7293bad4190b92f8d567192125ac5955bd
168 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The presence of XFA forms and embedded JavaScript, identified by the 'PDF_XFA' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' rules, strongly suggests an exploit targeting PDF viewers. The embedded script, though truncated, appears to be JavaScript designed to download and execute a secondary payload, as indicated by the obfuscated string concatenation and the overall structure. The benign URLs found are likely unrelated to the malicious functionality.

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
296673630577c535a97ab9061106469c7a0ce5a5f33dfb83c1dada7de631c7d2		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95534 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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