| Step | Mechanism | |------|-----------| | 1. MIME verification | finfo_open + whitelist ( application/pdf , application/epub+zip ). | | 2. Content inspection | ClamAV scan + PDF‑JS sandbox for script removal. | | 3. Storage isolation | Files stored outside web root with unique UUID names. | | 4. Execution prevention | X‑Content‑Type‑Options: nosniff . |
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