Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c3f7c51f632d7a…

MALICIOUS

PDF

93.7 KB
MD5: 187f37dc02bdb05fae67707bc7ff62e4 SHA-1: bdbee10046150f844a4cd4cd46af97219b6593e7 SHA-256: 10c3f7c51f632d7a3a81195c470ecc36768c08c4d484a4e91f495b0636edb3c6
168 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be exploited to embed malicious scripts. The embedded script, identified as JavaScript, is heavily obfuscated but its presence and the ClamAV detection (Pdf.Exploit.Agent-6136306-0) strongly indicate it's designed to download and execute a second-stage payload. The ML classifier also flagged this PDF with a very high probability of being malicious.

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
caa50764eec91ad263f3186bca618e16c21507b14ad7b489666c0b173c529038		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95200 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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