Bulk signing and stamping documents (batch file processing, adding signature and seal), which software is best suited for this task?

Question

Automation

friends! the task is to sign orders and annexes to them in bulk (usually Word or Excel documents that, in principle, can be converted to PDF when signed), it is advisable to drop them into a folder and, upon request, convert them with the addition of a signature and a graphic stamp, and drop the processed docks into another folder. well, if it also determined M.P. and correctly put in the right place in the document, then there would be no price))) there is a work as close as possible to the task from Ventafax - "For signature" is called, but the analogs that perform the task in batches are of interest. unsuccessfully I struggle in searches, until I found nothing ... advise something, if you have ideas or live experience in solving such a problem .. thank you!