In Friday's second round, Hedblom shot 5-under-par 67 and Millar a 3-under 69. Their two-round total is 8-under 136.
Hedblom, who squandered a chance to win the Malaysian Open for a second straight time three weeks ago, moved up from a tie for 10th place after the first round with a round that included three birdies and an eagle at the 510-yard fifth hole.
"I am having a good year this season and that is really all down to my putting which is a lot better than it used to be," he said.
Overnight leader and defending champion Lee Westwood (73) of England joined a group of seven players in sixth at 6-under 138.