Hi you have an interesting issue there,
if this is an input document you would definitely need to get a link to the pdf from the database,
http://wiki.processmaker.com/index.php/ ... n_Triggers
using a custom trigger you could manipulate the pdf, but perhaps need more tools (linux) see the suggestions on this page http://stackoverflow.com/questions/1274 ... ngle-pages
The problem then is still how to return those output files back to processmaker database and replace the original input file.
not sure on that part, perhaps sniff around the web services for features http://wiki.processmaker.com/index.php/ ... _Documents
I still think there are major considerations on processing time or it could be that you make another page that performs the job,
that is upload the PDF to be split, then that page calls processmaker with web services and does uploads the input documents to the case,
this would prevent messing with PM's files and risking opening a security hole or putting too much processing burden on your PM Server.
Hope this helps, I think it's definitely achievable