The directions from Capitol South to the Pakistani Embassy are:

A) Get on Orange Line going towards Vienna. 
B) Change lines at Metro Center towards Shady Grove. 
Get off on Van Ness UDC. 

Please review Metro Map at your convenience

Or Another MAP:

Address for Pakistani Embassy:

3517 International Court, NW Washington DC 20008
phone: 202-243-6500
 

The directions from Capitol south to Rayburn House Building are best described in the map