This was the Real Madrid attacking midfielder's first match for his country since the 2010 World Cup, and he capped a fine performance tonight by scoring the third goal after Chelsea's Oscar had bagged a brace.
Hulk added the fourth on the hour mark while Neymar and Lucas completed the rout against their overmatched opponents, who are coached by former Brazil playmaker Zico.
The South Americans dominated from the off and Oscar put them ahead in the 21st minute after slotting home from Neymar's assist.
The former Internacional playmaker then doubled his and Brazil's tally following some great interplay from Neymar and Kaka.
Brazil continued to dominate and only Iraq goalkeeper Sabri Noor stopped them from running riot, excellently saving from David Luiz's header, a one-on-one from Kaka and Hulk's long-range effort.
Even when Noor was finally beaten, the crossbar thwarted Adriano's effort.
However, Mano Menezes' men were not to be denied and Kaka showed he still has plenty to offer with a fine solo effort two minutes after the interval.
The 2007 FIFA World Player of the Year and Ballon d'Or winner avoided the challenges of two defenders before finishing past a helpless Noor.
Shortly afterwards, Hulk further extended Brazil's advantage with an excellent individual goal.
Manchester City and Real Madrid target Neymar got on the scoresheet 15 minutes from time and substitute Lucas completed the scoring.
Despite several players on-song, it was Kaka who was on everyone's lips at the full-time whistle.
"He gave some high-class assists and also scored one goal. With continuity he can be a crucial player for the team," said Oscar.
Former AC Milan man Kaka hopes tonight is just the start as he bids to retain an international berth.
"I'm very happy for this game, for the goal and for living again the spirit of being in the national team," he said.
"Mano used this game as a test and, in my case, I felt it like a training session and I tried to do everything the best as possible to continue in the team in the future."