Split PDF document into smaller documents

Hi,

I have a requirement, where invoice documents from multiple vendors will be sent to Appian as a single PDF (page number around 250 - 300) file. As the invoice documents for each vendor needs to be processed using IDP, we need to split the PDF document into multiple PDFs. The pages for each vendor invoice documents will not be static, it can vary depending upon the content on the documents. 

Kindly share your thoughts on how to proceed with splitting the PDF file to send them further for processing.

Regards,

Deepak Devarajan