I am looking for a solution (Script or Automator) to convert everything within a certain folder to one PDF file. Does someone know with which tool I could accomplish that? The standard PDF automator possibilities do not work… pictures-to-pdf. And I tried to use Abby Fine Reader, but the automator works just for single files, and I cannot find a possibility to combine them.
Does PDFpenPro has this possibility? Or Adobe Acrobat? Or is there a shell-script program I could use?
… I am stuck… 
Thank you in advance!
Rather than thinking about this as one problem, have you tried breaking it down?
For example, I would imagine an approach like this could work.
- Find something to convert one image to a PDF.
- e.g. ImageMagick
- Find something to convert one text file to a PDF.
- e.g. Pandoc
- Find something to trigger an automation against a file.
- e.g. a shell script checking the file extension and then running a command line instruction.
- Find something that can trigger against multiple files.
- e.g. a shell script can loop over multiple files.
- Find something to combine multiple PDF files into one.
- e.g. qpdf
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So an update 
Thank you sylumer – that is now exactly what I am doing!
Converting the files to PDFs is no problem with automator and calibre. When all documents are pdfs I merge them with qPDF! Thanks for the hint! Vidman2019 helped me on mauser.de, here, with the script.
In Hazel I use the shell script:
for f in $1; do qpdf --empty "${f%.pdf}-joined.pdf" --pages "${f%.pdf}"*.pdf --; done
That works if the files are named original-file.pdf, original-file-1.pdf. original-file-2.pdf etc. where original-file is any filename.
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