Compared with last year's third quarter, however, revenue was down 18%.
PricewaterhouseCoopers' New Media Group conducted the study for the IAB. Its estimates are based on data from the top 15 online ad sellers.
While the modest growth is a positive sign, the results may be attributed to more than an advertising recovery.
"The return to positive growth in both online and offline media is a healthy sign for the overall advertising industry, but should be viewed cautiously, as we believe that the positive steps that are being taken are as much cost-driven as they are recovery-oriented," said Tom Hyland, chairman of PricewaterhouseCoopers' New Media Group, in a statement.