How to click on an enumerated list and open pdf

in entity node i have created list of items enumerated like

An Employee Agreement

A Non-Disclosure Agreement

An Employee Invention Agreement

Each of the menu options listed are clickable
Upon clicking on the menu, system to popup a new window to display the required pdf document that can be opened by the bot.When the same use logs-in back, Bot to be configured to track the menu items used by the staff.

can you please suggest me after entity node which node is preferable to open a pdf document.how to do the above requirement