Final answer:
Isabel Poreba is the bridesmaid who can't resist Dwight's charms at Jim and Pam's wedding in 'The Office.'
Step-by-step explanation:
The bridesmaid at Pam's wedding to Jim who cannot resist Dwight's charms is Isabel Poreba. In the television series The Office, Dwight Schrute, a character known for his peculiar personality and antics, manages to charm one of Pam's bridesmaids during the wedding festivities.
This happens in the season 6 double episode titled "Niagara", where various office employees attend the long-awaited wedding of Jim Halpert and Pam Beesly.