Png to Pdf
here is video on how to convert one or many png files into Adobe Pdf Document:
If you want to automate conversion or avoid user Interface (UI) and run "Png to Pdf" application from command line - here is an example of how to do it:
"C:\Program Files (x86)\WhiterockSoftware\PngtoPdf\PngtoPdf.exe" inputfile.png outputfile.pdf