Virtualized server side rendering

Virtualized infrastructure instances are provided for running applications where electronic documents are rendered. The documents may comprise active content associated with risk of security issues. The documents are pre-processed to determine required software functionality for rendering. An index table including documents' characteristics relevant for displaying is generated. The characteristics include a correspondingly defined application for rendering a document, an OS for running the application, other. An identification of a document is received for displaying in a UI application separate from the virtualized instances. The first document is rendered on a virtualized instance from the infrastructure instances. The virtual instance is selected based on requirements for rendering the requested document, such as compatible application and OS. The rendered first document at the virtualized instance is displayed at the UI application on a virtual screen. The request for displaying is received by a user in a document analysis scenario.