What version of Word do you Have?
Word 2004 if you had Acrobat as well the PDFmaker menu bar was installed by Acrobat you could convert a .doc Document to PDF. It required the use of VBA and and a Macro which created the PDFMaker menu. I was Secretary and Treasurer of an association for 30 years and I converted many a 2004 Word Document to PDF using PDFMaker.
You still had the same problems with word converted to PDF as today. If there are any section Breaks or Page breaks the pdfs were broken up into pieces you have to put back together.
I still have some .Doc files from early 2006 and with Office 2011, I opened one, and just saved it as a Pdf no trouble. I didn't convert it and didn't save it as a Docx.
I simply went to Save as and chose PDF.
And I also went to Print menu> PDF> adobe quality PDF. and was able to make a PDF.
Also I just went to print menu > PDF and just chose PDF which makes an Apple version of PDF.
I don't know where anyone got the idea you can't make a PDF from a Doc File. Maybe in a future version That doesn't read doc. but for now
I has read the poster's query differently. He said that ACROBAT has stopped converting Word files. I interpreted that to mean he was using the File > Open command in Acrobat to open .doc files which can be done in Windows and not on the Mac. I probably read the posting a little too quickly late at night and my brain wasn't totally functional. Sorry.