The data leak emerged as polls predicted Macron, a former investment banker and economy minister, was on course for a comfortable victory over far-right leader Marine Le Pen in Sunday's election.
Marine Le Pen has a mountain to climb going into the final hours of her presidential race against Emmanuel Macron.
The independent candidate is predicted to win 62 percent of the votes on Sunday.
People in France really, really don't like Donald Trump, who's spoken favorably of far-right presidential hopeful Marine Le Pen.
But the survey found that neither the Front National nor En Marche ! would win an absolute majority in Parliament.
Macron said Le Pen was a "high priestess of fear" who would start a civil war, while Le Pen said her rival was a "darling of the elite."
The party deputy said a controversial speech was a deliberate "nod" to one given by rival François Fillon.
The French far-right leader's extreme Euroskepticism would pose an existential threat to the bloc.
"The dysfunction of the EU is no longer sustainable," the French presidential frontrunner said.
Polls predict Macron, a former economy minister, will win the May 7 run-off with about 59-60 percent. But the momentum has recently been with Le Pen, who has clawed back about five percentage points over the past week.
Marine Le Pen faces a huge uphill battle to defeat Emmanuel Macron in the second round of the French election.
After Francois Fillon's demise and Emmanuel Macron's rise, the Russian establishment looks to Marine Le Pen.
Expatriates in seven African countries overwhelmingly backed centrist newcomer Macron, while the far-right Le Pen fared badly.
The euro currency rose to its highest point since mid-November after Macron was revealed as the winner.
Here's what to make of the results from one of Europe's most exciting contests, as it heads into its second round on May 7.
The election now heads into its second round, set for May 7.
Le Pen is way down in the polls. But her base is energized, and as the French economy sputtersr and fears of Islamist militants grow, it may be too soon to discount her chances.
Macron may be hoping his chat with Obama will boost his credibility ahead of a tight vote.
French newspaper Libération described the speech as "one of the most hardline of [Le Pen's] campaign so far."