The below code is useful to open pdf file from Static Resource using visual force page.
Step 1: Upload pdf file in Static Resource
Setup -> Develop -> Static Resources
For example, Create static resource name as ‘test_pdf”.
Step 2: Create Visual force page with below code.
<apex:page standardStylesheets="true" sidebar="false"> <a href="{!URLFOR($Resource.test_pdf)}">Click Here to Download Pdf File</a> </apex:page> -----------------------*****Thank You*****--------------------------