Available in pre-release 3.7
To delete a page from a PDF using SumatraPDF:
SumatraPDF clean input.pdf output.pdf 1-3,5-N
This deletes page 4 from input.pdf and creates output.pdf
You can delete any number of pages by providing the range of pages to retain.
N is special character meaning: “last page”.
For all options see SumatraPDF clean.