The KVM version of the latest vQFX routing engine VM (vqfx10k-re-15_X53-D63) seems to be broken. If you try to run it, it will crash with a kernel9 panic and will never boot up completely.
However you can “cheat your way around this”:

1.) Simply download the Vagrant .box file of the D63 RE.
2.) Extract the .box File with 7zip – you will extract a file with no extension.
3.) Extract this file again and “magically” a file called packer-virtualbox-ovf-1491593710-disk001.vmdk will appear.
4.) Upload this to eve, convert it to hda.qcow2, fix permissions and run it – voila: D63 on EVE.

PFE is the same (no D63 Version available, since the PFE is not tied to a Software Version).

It’s always a good idea to dig around the provided Files from Juniper once something breaks 😉

Download the Files here: http://www.juniper.net/support/downloads/?p=vqfxeval#sw