detail error message:
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW cat=[android.intent.category.DEFAULT] dat=file:///sdcard/test.pdf typ=application/pdf flg=0x10000000 }
Since your catch block has ActivityNotFoundException, it means that you don't have any activity/application that can read a 'application/pdf' filetype format. Install any pdf viewer from the Android Market (Adobe recently release theirs), or else use the above mentioned open source pdf viewer and your problem will most probably will be solved.
http://code.google.com/p/apv/downloads/list
https://market.android.com/details?id=cx.hell.android.pdfview&feature=search_result
When you start activity with your given params, it searches for all applications/Activities/Intents that are registered to open pdf format. Since you have none in your device, you are getting the ActivityNotFoundException