Ms D'Andlau claims this is because Walt Disney siphoned a total of €930m (£780m) out of the company through artificially high licensing and royalty fees over the past decade.
Walt Disney imposes fees on Euro Disney for using its animated characters, but the fund says the rates are at least three times standard market practice. The fund also accused Walt Disney of deliberately concealing the eye-watering value of Euro Disney's extensive land rights in areas surrounding Paris in order to make a low-ball buyout offer of €1.25 a share as part of a €1bn restructuring launched in 2015.
The value of Euro Disney's 2,200 hectares has been independently valued at upwards of €1.9bn or about €2.40 a share, making the park worth at least three times the Walt Disney offer, CIAM says.
"It seems as though Walt Disney has spent a bit too much time studying its own Scrooge McDuck cartoons," she quipped.
The activist fund has launched a three-pronged legal assault on Walt Disney, taking the parent company to the French criminal courts for misuse of corporate assets, publication of inaccurate accounts and misleading information.
In the civil courts, CIAM is fighting for shareholders to be reimbursed for €930m of fees overpaid by Euro Disney. The company has also taken its case against Disney's €1.25 a share offer to the Supreme Court.
Walt Disney has previously dismissed the action as "utterly without merit".