I am not using Acrobat now but the following procedure may work with other software. I use SumatraPDF to reading PDF files. Here are the two commands (as admin) I use:
ftype SumatraPdf="D:\MyFolder\SumatraPDF.exe" "%1"
D:\MyFolder\SumatraPDF.exe is the installation path. ftype and assoc are documented commands used in Command prompt.
Here comes the complicated part. If there is no pre-installed PDF reader those commands will work as usual in Window 7. But in Windows 10, there is a pre-installed UWP app. So user has to do it manually from Settings app, commands will not applied (though some dangerous registry hacks present). Adobe acrobat reader has some shell extensions which doesn’t work in normal way.
tl;dr Just try those commands