Cristina Gallach, spokeswoman for the European Union's foreign policy chief Javier Solana, said the six had reached agreement in a telephone conference of officials earlier Friday.
Britain, China, France, Germany, Russia and the United States would meanwhile continue to examine the latest propositions from Tehran, with which they still wanted "substantive negotiations," she said.
Gallach said earlier that Iran's proposals do not answer key questions about its own nuclear programme, adding to growing Western scepticism of the offer.
"The document is more focused on global questions than on nuclear ones," she added.
In an interview with The Washington Post, Iranian President Mahmoud Ahmadinejad's senior adviser Mojtaba Samareh Hashemi said the package calls for setting up an international system to scrap and prevent nuclear weapons worldwide.
But Hashemi did not reply directly when asked if it contained a promise that Iran would meet international demands to halt uranium enrichment.
The package was delivered to representatives of the six nations tasked with persuading Iran to halt its uranium enrichment drive which they suspect is for making atomic weapons.
Tehran denies the charges and says its nuclear programme has peaceful goals.
