Updates
** Shares of Australia's Worley WOR.AX rise as much as 3.8% to A$12.420, hitting their highest level since February 26
** Stock logs best intraday session since April 21
** Engineering firm says it will undertake a new share buyback of up to A$300 million ($217.65 million)
** Jefferies says WOR's balance sheet is well-positioned to deliver the new share buyback
** Stock down nearly 3% this year, including the day's move
($1 = 1.3784 Australian dollars)
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))