Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5cddef685f89fd…

MALICIOUS

PDF

12.0 KB
MD5: f4d8b60ec9e5cc95b2d8e88d350cabd0 SHA-1: e29a5db03ef920a817be39a47a9a26af08e74787 SHA-256: 4d5cddef685f89fd9c3fb1d53e5f731eb0db07acfc82b0257a6459be67806f7d
168 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript

This PDF file is malicious, exploiting CVE-2010-0188 via an XFA form. A JavaScript stager was recovered, which is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. The embedded URLs are related to Adobe XFA schemas and are not directly indicative of malicious activity.

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
51ded69f8051d1a67131d24433cfa80992c3d7fe90b5545c8c5df91ebce548dd		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11611 bytes
xfa_numeric_stage_000.js
722b681c5aff6d27cbc61b9317f64c328007eb05f7852b2a870d9c402937e2ee		 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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