Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c6ad68fd386bc3…

MALICIOUS

PDF

12.0 KB
MD5: e9a2e703ffa8200ed0b79b6aa2ab33b9 SHA-1: 4e97b7e028aaf29af71c496e466fe36e8d184e4c SHA-256: 57c6ad68fd386bc3dd0b883abb248424425a87d990f59356d85690c5dffdafe4
170 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter T1059.007 Command and Scripting Interpreter: JavaScript

This PDF file contains an embedded XFA form that leverages the CVE-2010-0188 vulnerability in Adobe Reader. The analysis recovered a deobfuscated JavaScript stager (xfa_numeric_stage_000.js) which is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates malicious intent.

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 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
  • 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
7f828bbb116e4ecb57b88fc53b2ed32c65b4f3098e6eb3e98fbaf92a3c70cce9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11611 bytes
xfa_numeric_stage_000.js
94c6d314dac55555ad605a9f872e2731fff948edc3a2cdce63e3b498c4781143		 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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