PDF malware analysis — malicious · a5fac53fa1903b6c

MALICIOUS

PDF

38.7 KB

MD5: 22c8cd7cd7a6df4ccb690991c1cac581 SHA-1: efa47c828babfca0afb8b6579d198fe02268333f SHA-256: a5fac53fa1903b6c5447b9787e04339e83690b6255d1db0419e6dde538f22b69

172 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains XFA (XML Forms Architecture) content, which is known to be exploited by CVE-2010-0188. The heuristic firings indicate that the file uses XFA numeric JavaScript stagers and is detected by ClamAV as Js.Exploit.HTML-30. A deobfuscated JavaScript file was recovered, which likely contains code to download and execute a second-stage payload. The embedded URL is likely related to the XFA schema.

Heuristics 6

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.
ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Exploit.HTML-30
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.
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://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xfa_numeric_stage_000.js` `2805d8efb2a5d535b13145000dca1b7da0d8ec31f5f2a8be6e54a6fcc90223eb`	deobfuscated-js	XFA rawValue numeric decoded JavaScript (raw) at offset 0x347	3743 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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