Right click the file and see what action is listed in bold letters. Possibly "print", not "open".
Could you check the default app open settings for PDF files?
Press windows key and type Default and choose Default Apps - Select Set Default by app - choose Adobe Acrobat DC Pro
- Manage - see the PDF the default app is Acrobat Pro.
Also check when you right click the pdf file - Open with - the default app is Adobe Acrobat Pro.
Also, change the default printer to another printer. (like Microsoft print to PDF or Microsoft XPS Document Writer)