Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f51d9c96cdb7e65…

MALICIOUS

PDF

13.1 KB
MD5: d5c78ff9cd75fcc001ebf084ef658314 SHA-1: 30b7b0fadc84dc1ff321eea7eb3a88451681da10 SHA-256: 9f51d9c96cdb7e652bb4268e2bcf5679c11174d88d23b1f8b8790a53973a0560
66 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF sample contains an embedded script payload and is flagged by an ML classifier as malicious. The presence of XFA forms and embedded files suggests an attempt to leverage PDF vulnerabilities. The embedded script, though partially obfuscated, appears to construct a URL from concatenated strings and likely downloads a second-stage payload. The document body contains JavaScript-like code that manipulates strings and character codes, further indicating malicious scripting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Embedded script payload in PDF stream medium 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xci/
    • 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_file_obj0008.bin
b230de8827aed32580efc94299c6493e749716c1fdd40824c54c1fbfedefb771		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD5 12682 bytes

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