Pam is a stranger played by Sarah Zimmerman and encountered by Dwight and Nate in the season 7 episode "China." She shares her first name with Pam Halpert, which is the source of confusion.
Some fans have nicknamed her "Perjury Pam" because of her proclaimed willingness to bend the truth.
Season 7[]
While discovering the empty lot that Pam Halpert claimed as the site for a prospective modern office suite, Dwight and Nate accidentally meet a random woman who happened to hear Dwight saying "Pam" aloud and approached their vehicle. After a brief exchange, Dwight relishes the outcome exclaiming that he "Can't wait to do to Pam, what he just did to Pam."