Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c71ed2cf6d4655b…

MALICIOUS

PDF

12.0 KB
MD5: df819bda9aa152d3d4d9abff7b2da7ec SHA-1: a1a52a5e8b5c8f3ce827f8e693532ea8513dc4ca SHA-256: 6c71ed2cf6d4655b237b5b00fb5d43be9c0cfd0d3bf780b8601550e573ffa6b5
158 Risk Score

Malware Insights

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

The PDF file contains an embedded JavaScript stager exploiting CVE-2010-0188 in Adobe Reader. The deobfuscated JavaScript, named 'xfa_numeric_stage_000.js', is designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the embedded nature of the script points to a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • XFA numeric JavaScript stager high PDF_XFA_NUMERIC_JS_STAGER
    PDF XFA script reconstructs a hidden JavaScript stage from numeric field data or a character table, then evals the result. The decoder is gated on XFA script, numeric staging, and recovered exploit-like JavaScript or shellcode markers.
  • 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 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/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
4e614c1783d56c97b89d85e764fb66640fefc3658bf8b7cdb48c55d9591c3e0b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11611 bytes
xfa_numeric_stage_000.js
fa499a035641389700b3c1e6034ce9a1c67e919fcbdf6ac7e24a3d25d9732ca0		 deobfuscated-js XFA caret-number decoded JavaScript (raw) at offset 0x4C0 3422 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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