You really are better off not doing that.
As a possibility.
Convert your PDF's to TIFF and place them in a database and link them to the the locations.
Do you have an way to match each drawing up to a specific location. I imagine your are talking possibly thousands of drawings.
You may be able to reverse engineer an attachment table. Normally when you create attachments it links the attachment to a specific feature. The relationship is via a relationship id. But if you could specify a generic relationship in the attachment and relate it to a unique attribute in your feature you may be able to load tiffs or jpgs into the attachment table.
This will most likely create a LOT of log files that will need to be removed
you also might be better off creating a single pdf of your drawings that are indexed and distributing that.