PDF malware analysis — malicious · 888ff8939e3ace7b

MALICIOUS

PDF

31.4 KB

MD5: 851be467ff1c13044c2b7cec4c6fe4c0 SHA-1: cf04d5a11a975bd8600620aaec2114b75a536a03 SHA-256: 888ff8939e3ace7bf2524bc6944ccac41eb6afb7b937e8a73b49917f6f82c6e0

230 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains an XFA form that exploits CVE-2010-0188 in Adobe Reader. A JavaScript stager, recovered as 'xfa_numeric_stage_000.js', is embedded within the XFA form's rawValue. This stager is detected by ClamAV as Js.Exploit.HTML-30 and likely downloads and executes a second-stage payload. The embedded URL is related to XFA schemas.

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

ClamAV detected this file as malware: Js.Exploit.HTML-30
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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` `565ca3c06231cbb0c8d1d17965e13554f07fb29d476ad82c62aeee79495dd52a`	deobfuscated-js	XFA rawValue numeric decoded JavaScript (raw) at offset 0x3F0	3735 bytes
Detection ClamAV: Pdf.Exploit.Agent-36962 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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