generally, PDFs can not be submitted electronically because the IRS computers will not know how to read those documents. some times you can e-file your return if you use form 8453 to submit certain specified forms/schedules by mail to the IRS, form 1116 schedule B is not one of them so if you have to file it you'll have to mail in your return including the pdf.
pro software that I am aware of has the same limitations with regard to PDFs.
