PDF malware analysis — malicious · 85703af99b9daeac

MALICIOUS

PDF

51.4 KB

MD5: 7ad82b5e3e32877bb3724189b7fa7cde SHA-1: f21cfa4c86b8e28bc9092d011f6abfe4f82098bc SHA-256: 85703af99b9daeac4edd7c0c81970d09f1088d603f327d4d6eebe2dd642793ea

268 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1190 Exploit Public-Facing Application

The PDF file contains an XFA form that leverages the CVE-2010-0188 vulnerability in Adobe Reader. Static analysis identified a JavaScript stager within the XFA form, which is further confirmed by ClamAV detections (Js.Exploit.HTML-30 and Pdf.Exploit.Agent-36962). This stager is designed to download and execute a second-stage payload, indicated by the 'XFA numeric JavaScript stager' heuristic.

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.
Suspicious extracted artifact high 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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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` `25087cafdf7c63b6000f8f6eb2ba97d4f5e8f7ef3f7dedb234147d8333c2bdd3`	deobfuscated-js	XFA replacement character-table decoded JavaScript (raw) at offset 0x30C	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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