PDF malware analysis — malicious · fdc61cea17ffe204

MALICIOUS

PDF

51.7 KB

MD5: c61c83598627dff61f474a334cbaf5b5 SHA-1: 8c2f1c71f34fe0fdf52583b362820cf69ff6f033 SHA-256: fdc61cea17ffe204e0ff02c43d32c8058c691d88564a77269b481cc60cd65bd3

230 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The PDF file contains an XFA form that exploits CVE-2010-0188 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). The deobfuscated JavaScript likely downloads and executes a second-stage payload, indicated by the 'PDF_XFA_NUMERIC_JS_STAGER' heuristic. The embedded URL is associated with XFA schemas and may be used in the exploitation chain.

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` `632846ad02306da063623a55dbebe4abebf9f87420ed2d4fad85d35de7e4f889`	deobfuscated-js	XFA replacement character-table decoded JavaScript (raw) at offset 0x30C	3747 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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