It's an interesting question. In Luke 22, we read:
20 Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
21 But, behold, the hand of him that betrayeth me is with me on the table.
22 And truly the Son of man goeth, as it was determined: but woe unto that man by whom he is betrayed!
23 And they began to enquire among themselves, which of them it was that should do this thing.
It sounds like in Luke 24, Judas was at the Eucharist-
They ate supper, then Jesus gave the Eucharist with the Words of Institution, and Jesus noted that Behold, the betrayer's hand was at that time on the table.
The normal assumption would be that Judas partook.
In John 13, Jesus says when they are gathered the night of the Last Supper:
18 I speak not of you all: I know whom I have chosen: but that the scripture may be fulfilled, He that eateth bread with me hath lifted up his heel against me.
It suggests that they were eating bread together.