This legato exercise, given to a guitar student, is a bit more challenging than most of the stuff I give out to those new to legato (hammer-ons and pull-offs).
Because you are only picking the 1st of every 6 notes, your fretting hand will be doing most of the work.
The pattern goes Pick - Pull - Hammer - Hammer - Pull - Pull
Here is the Guitar Pro 6 tab for this lesson:
John Taylor - guitar and bass instructor for Mile High Shred.