A man leant out of his car and tried to grab a woman when she was walking near Northgate Hospital in Great Yarmouth on Sunday morning.
The victim, in her late 30s, was walking along Churchill Road at around 6.50am when a small dark car pulled up near to her.
As she neared the car a man opened the passenger door, leant across and tried to grab her.
The woman pulled away and managed to attract the attention of a dog walker who stayed with her as she walked away.
The car then drove off.
Police are appealing for witnesses to the assault.
Call PC Lynne Prowse on 101 or Crimestoppers anonymously on 0800 555 111.
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