PDF malware analysis — malicious · ab38d404617bc695

MALICIOUS

PDF

38.7 KB

MD5: 53770a4ebe7f0669c9f45543d97a4ac1 SHA-1: 8fbc6553043c455920160df74b39c6349fac9714 SHA-256: ab38d404617bc69507f20cce801142ee80f6d87bbe7747ccb5bdb32f62a68672

268 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.001 PowerShell T1059.003 Windows Command and Shell T1059.007 JavaScript

The PDF file contains an XFA form that leverages the CVE-2010-0188 vulnerability in Adobe Reader. This vulnerability is used to execute a JavaScript stager, which is heavily obfuscated and detected by ClamAV as Js.Exploit.HTML-30. The stager likely downloads and executes a second-stage payload. The embedded URL is a legitimate XFA schema URL, but the exploit itself is the primary indicator.

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` `2ac267eee90140a93b31a38f26a96d9fc18b64aab17ae1497ee06734cd138f77`	deobfuscated-js	XFA rawValue numeric decoded JavaScript (raw) at offset 0x347	3743 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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