Close PDF that is open in Adobe Acrobat Pro DC

[dpfbin2]

Say I have a PDF "C:\abc.pdf" that's open (as one of several tabs) in Adobe Acrobat Pro DC. What command do I use in AHK to close it?

(In Acrobat I can (1) click the cross on the tab; (2) select the tab > Go to file > Close File; or (3) select the tab and press Ctrl + W.)