Sort bookmarks (or extract) by page count within bookmark

Hello!

If this has already been solved, I apologize but was unable to locate (maybe my search terms weren't correct).

I have several very large PDF docs (11 thousand pages+) that are for a mailing.  However, the customer did not sort the recipients before export (and after further investigation, they cannot figure out HOW to do such).  The resulting file(s) have recipients with 3 pages, some with 4 and perhaps even some with 5 pages.  These files will need to be printed, and then folded and inserted into envelopes by hand if I am unable to come up with a more automated way of sorting the variable page groups.

I believe I have a way to place a bookmark at the "first page" of each recipient -- what I am looking for now is a way to either sort those bookmarks by their page counts (3, 4 or 5) or extract them by page count.  The former is preferred as the later would make a metric ton of files.

Any thoughts/ideas/help is appreciated!

Message was edited by: Chad Wentzel