Social Engineering
There are probably lots of movies like that. One that comes to mind is The Secret of My Success, where the character played by Michael J. Fox actually is an employee... in the mail room. However, he pretends to be an executive.
A Trojan horse.
An "impostor" is someone who pretends to be someone else, or who pretends to have status or credentials that he lacks.
He pretends to be Dimmesdale's doctor.
When Huck visits Mrs. Loftus, he pretends to be a girl named Sarah Williams from Hookerville, who is visiting relatives in the town. This disguise allows him to gather information discreetly about the search for Jim.
An individual who pretends to be knowledgeable in order to deceive is known as a charlatan. One who pretends to be knowledgeable or clever in general can be called a wiseacre.
A "trojan horse" is not a virus; it's a type of malware that may be spread like a virus. It hides within other programs, or pretends to be a trusted program, but it is really malicious software. Like the Trojan Horse in the Iliad, it secretly does damage once you mistakenly let it into your computer system. It can be used to steal information from the computer.
Pretends to be ill is when a person is acting as if he/she is ill but actually the person is not ill.
someone says something mean to you in the hall at school. -apex
imposter
A push poll is a political technique that pretends to take a poll.
she pretends to be his girlfriend she pretends to be his girlfriend