The student immediately called police and described the man as 5 feet 7 inches tall. He was wearing glasses, a gray sweater and dark pants, she told authorities.
UCF police said the description of the incident closely matches two similar incidents that happened on campus within the past month and a half.
In December, a student reported that she was inappropriately grabbed by a man inside the Business Administration II building, the UCF Police Department said.
The student told investigators that the incident happened at about 5:50 p.m., UCF police spokeswoman Courtney Gilmartin said.
The man, who she did not know, was lingering near a vending machine and started talking to her before grabbing her, Gilmartin said.
"It's just unfortunate that we have to deal with that here at UCF. I feel like we're so close as a family and as a university. It's incredible that we have to do this," UCF student Ponatoyas Jusakus said.
Investigators said the woman ran from the building and reported the incident about an hour later.
Police said they do not believe the two incidents are related to a similar encounter at Valencia College this week.
"Detectives are currently revisiting the case from last month and reviewing surveillance video from last night," Gilmartin said. "In regards to the incident at Valencia College Tuesday night, at this point, the circumstances and suspect descriptions do not match."