John Cusack -- Intruder Arrested at Malibu Home

A woman with a serious thing for John Cusack got busted at the star's home after allegedly making multiple attempts to enter his home Tuesday evening ... TMZ has learned.

According to law enforcement sources ... the woman tried to get in through a window at Cusack's Malibu estate, but failed. We're told a short time later Cusack's security caught her scaling a fence on the grounds ... and detained her until L.A. County Sheriff's Deputies arrived.

Deputies arrested 45-year-old Elizabeth Pahlke, and booked her for felony stalking and burglary.

Now here's the twist ... we're told Pahlke has a history with Cusack ... and in fact, his security team had served her with a restraining order earlier on Tuesday. It's unclear at this point what prompted the restraining order.

Our sources say Pahlke made a beeline for Cusack's home some time after receiving the document.

She is currently being held on $150,000 bail.

We're told Cusack was not home when the madness all went down.

Also, Pahlke was not holding a boombox over her head when she got busted.