From Forum Nokia Wiki

With the application you can read PDF documents on the display of your device. Documents can be accessed and opened in the following ways:

• Opening an email attachment from received e-mail messages (network service)
• Document sent using Bluetooth technology to your Inbox in Messgaing
• Using the File manager to browse and open documents stored in the phone memory and on memory card
• Browsing Web pages

http://europe.nokia.com/A4164022?url=http://nds1.nokia.com/phones/files/software/Nokia_E61_Adobe_PDF_Reader.sis