Adobe Reader is not suitable for printing PDF files using a batch file because it remains open after the print is done and there is no simple, safe & reliable mechanism to close it. Instead use Ghostscript commandline as shown below:
gswin32c -dPrinted -dBATCH -dNOPAUSE -dNOSAFER -q -dNumCopies=1 "C:\test.pdf"
*Must be a recent version of Ghostscript, e.g. 9.x