The South Korean tech giant expected its overall sales to have fallen 5.3 percent on-year to 62 trillion won in the three-month period. The sales estimate stood at 60.6 trillion won on average.

The company logged a quarterly high record during the third quarter of last year.

Since late last year, Samsung has been grappling with the semiconductor industry's downturn amid slowing demand for smartphones and other electronic gadgets.

Samsung did not break down the performances of its respective business divisions, saying it will announce the detailed earnings later this month.

Market watchers said a supply glut of DRAM and NAND flash chips, which account for more than two-thirds of the firm's sales, dragged down its profitability.

They voiced optimism, however, for an improvement down the road, expecting prices of NAND, mostly used in mobile devices, to pick up later this year, given a stabilizing inventory level and rising demand.

"It looks like Samsung Electronics has bottomed out," said an industry watcher who asked not to be named, adding that its earnings would recover next year after a seasonal slowdown during the fourth quarter.

The mobile division was also expected to have logged improved results during the third quarter on the back of strong sales of its Galaxy Note 10 and its cheaper Galaxy A series, the analysts said.

The company earlier announced that it has sold over 1 million Galaxy Note 10s in South Korea, making it the fastest Samsung smartphone to reach the milestone. The Note 10 was released only in 5G model in the domestic market on Aug. 23.

"The handset division's operating profit ratio dropped to the 5-percent level during the second quarter but is expected to have recovered to the 8-percent level during the third quarter," said Yoo Jong-woo, a researcher at Korea Investment and Securities Co.

Shares of Samsung Electronics were changing hands 0.21 percent higher at 47,850 won on the Seoul bourse as of 9:15 a.m. The earnings guidance was announced before the market opened. (Yonhap)