InfoPath Dev

In my work we must have multiple process owners that have to sign off on purchase requests. Some individuals like this in PDF format, while the main contingency would be willing to use InfoPath Forms. Is it possible to export out to PDF with digital signature blocks?

Not without a 3rd party application. You could however export to a document using quick parts. You'd need to set up the template word file. If that's agreeable to your org, look up combining word and metadata through quick parts.