Have a look at the thread discussing exactly the same issue:
It suggests a few solutions, but no easy option, which, I think, does not exist. I can add another one - if you are familiar with PHP (does not have to be FileMaker PHP API) you can build a page to generate PDFs from PHP. Unfortunately, you will have to build your reports from scratch in PHP and will not be able to use your FileMaker layouts.
I think Mike Beargie suggestion re using robot workstation is the easiest to implement.
Thank you, Nicolai
I gone through the thread which you shared. It seems we have challenges on "save pdf" option and "print page" options with the webdirect. looking forward I'm keep searching to find solution or alternate option.