Thank you for your comment.

But in my PDF file all the Description fields (Title, Author,Description etc.) has value. But the PDF Producer is Acrobat Distiller 7.0 not the Acrobat writer.

I am not sure whether thats the problem. And also i want to retrieve the page size value, for this i added these lines and tried

my ($startx,$starty, $endx,$endy) = $pdf->PageSize (1) ;

print "$startx\t$starty\t$endx\t$endy\n";
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These lines also not working for the same PDF files.But for some PDF file it prints the value as

0       0       612     792
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But the page size value in the description is

8.50 x 11.00 in
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I want the same value as output (in inches). Can anyone comment me in this and whether i am going in right direction or show some other way

Thank you once again and in advance

Punitha