PDF malware analysis — malicious · 5275256ef4faafd8

MALICIOUS

PDF

47.1 KB

MD5: 21b5dec3b2dd7a23c2fe0c9e52a4f566 SHA-1: 92b5a25986f2b3561b3d65c345e51ea4e74b5b72 SHA-256: 5275256ef4faafd8873780168294455b162140fd54a751c890ddf4a32009afc8

260 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains XFA (XML Forms Architecture) content, which is known to be a vector for exploits. Specifically, the 'CVE_2010_0188' heuristic indicates exploitation of a LibTIFF vulnerability within Adobe Reader. The 'PDF_XFA_NUMERIC_JS_STAGER' heuristic confirms the presence of a JavaScript stager, which is responsible for decoding and executing further malicious code. This stager likely downloads and executes a second-stage payload, as suggested by the 'EXTRACTED_FILE_CLAMAV' detection. The embedded URL is likely related to the XFA schema but could also be a lure or part of the exploit chain.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
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` `a9819450b616932d7819afb09c500fac95b17b6728efc54d70ff1228e404b9c6`	deobfuscated-js	XFA split character-table decoded JavaScript (raw) at offset 0x320	3810 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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