Zero-Day & Known Exploit Signature • QuickSand v2.3.0

Detecting CVE-2026-34621 in Malicious Documents & Streams

Summary: pdf.exploit Adobe Acrobat/Reader UTF-16BE Names escape & Widget Base64 JS RCE (CVE-2026-34621). QuickSand unpacks nested container streams (OLE2, OOXML, RTF, PDF filter chains, and archives) in memory to detect CVE-2026-34621 payloads in <50ms.

CVE-2026-34621 Vulnerability Identifier

T1059.007, T1203 MITRE ATT&CK Technique

PDF Target Stream Vector

QuickSand YARA Signatures for CVE-2026-34621

YARA Rule Identifier	Stream Detection Description	MITRE ATT&CK	Engine Module	Severity
`pdf_exploit_CVE_2026_34621`	pdf.exploit Adobe Acrobat/Reader UTF-16BE Names escape & Widget Base64 JS RCE (CVE-2026-34621)	T1059.007, T1203	PDF	10/10

Scan Files for CVE-2026-34621 via REST API (<100ms)

Block weaponized uploads exploiting CVE-2026-34621 in your web app, S3/GCS bucket, or SOAR phishing workflow:

curl -X POST "https://malwaretracker-912661936520.europe-west1.run.app/v1/scan?store=false" \
  -H "X-API-Key: mt_live_YOUR_API_KEY" \
  -F "file=@untrusted_document.doc"

Get Free API Key (1,000 Scans/Mo) → Scan a File Online Now

Detecting CVE-2026-34621 in Malicious Documents & Streams

QuickSand YARA Signatures for CVE-2026-34621

Scan Files for CVE-2026-34621 via REST API (<100ms)

Related Document Exploit CVEs Detected by QuickSand