Install the printer - open the pdf document and print the page the page by selecting 'dopdf as the printer and choosing the page you wish to print from the options, i.e. print page 6 to 6. The page will be 'printed' as a pdf file in the location you choose.
Yes download and instal Pdfsam as suggested in my post of 25th February! it will do what you want (and a whole lot more besides).
Alternatively if you don't want to instal any software, google for "online pdf splitter free" and you will get a number of offferings that would appear to able to do what you want (although I have not used any od the services as I use Pdfsam).