I rooted it successfully, thank you!
However, I am now having some issues installing xposed framework, have you tried install xposed framework in this phone model?
I installed this custom version of Xposed: http://forum.xda-developers.com/xposed/unofficial-xposed-samsung-lollipop-t3180960 because with the original one, the phone doesn't startup (it stays in the samsung screen).
That custom xposed version was installed good, and phone started up good, but when I install and activate an xposed module and reboot the phone, I get the same problem, phone stays in the samsung screen.
I hope it's possible to use xposed framework in this phone model, I will open a thread soon about this issue, thanks for the help!