Character count from Acrobat

Hi all,

I am using the Acrobat 8 professional version. I am using various application to generate the pdf. My clients need the number of characters in the document. Some of the applications support to collect character count, some of not. But my final output for all those applications is/are "pdf". So i got approval from my client to collect the character count from the "pdf" document. I find in the "Acrobat 8 professional Help menu" to do this. But I cant able to find that. Is there any way to get the character count through the PDF? Please help me.