PDF malware analysis — malicious · 16d2df9b30df48a4

MALICIOUS

PDF

38.6 KB

MD5: 1c1fa8d1ab3c9f0f7228f232475703d9 SHA-1: 8f5ac11546894ef8bbaf625311264cd389953714 SHA-256: 16d2df9b30df48a4185d8c4939fe8dc5b811252aefe71ee88392dbda0ce1af98

302 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages the CVE-2010-0188 vulnerability, targeting Adobe Reader's XFA forms. Static analysis revealed that the PDF contains a numeric JavaScript stager, which is responsible for decoding and executing a larger JavaScript payload. This JavaScript payload, identified as 'xfa_numeric_stage_000.js', is designed to download and execute a second-stage payload from the reconstructed URL 'http://fikikif77.info/w.php?f=&e=4'. The presence of XFA forms and the specific CVE exploit strongly indicate a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
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` `6515ff479fef5e507725628605145fb609cf43675dce0874d7b5cd848d85bfce`	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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