Malicious PDF — malware analysis report

Static analysis result for SHA-256 154800172900a11c…

MALICIOUS

PDF

14.4 KB
MD5: 9039eafa12737c77d4b6b972db5887eb SHA-1: 8dccdc97fb43f5cce26b9bb173029ccce0355d5f SHA-256: 154800172900a11c0ddd3e2b225f377c057b868313293b8e8e0511515696b4c9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains XFA form elements and triggers a critical PDF_XFA_HEAP_SPRAY heuristic, indicating it's designed to exploit a heap spray vulnerability. This exploit likely involves executing embedded JavaScript, as suggested by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_EVAL firings. The primary IOC is the decompressed JavaScript stream, which is the likely payload carrier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/3.1/
    • http://www.xfa.org/schema/xfa-template/3.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off00000043.js
bfaf952fe7c1053ad7cf56dd2da096deb04769f8dea47cc204942b392faf8d62		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43 4194304 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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