There is a ban on foreign donation, but exceptions could be made.
Section 3(1) & 2 Foreign Interference Act 1982
D3. (1) Subject to the provisions of this Act, it shall not be lawful for an alien to perform, do, hold, take part in, aid or abet, or allow, any restricted activity in Malta.
(2) For the purposes of this Act, "a restricted activity" means - (a) any activity, or participation in any activity, of a political nature or having a political purpose at any time during the period commencing nine months prior to the date on which Parliament would, unless sooner dissolved, stand dissolved by virtue of article 76(2) of the Constitution and the date of the publication of the results of an election, or at any time between the dissolution of Parliament according to article 76(1) of the Constitution and the date of the publication of the results of an election;
(b) the provision at any time to or for the benefit of a political party, person, club or similar institution, whether directly or through an intermediary agent, of any money, equipment or other material, by way of gift or otherwise not against equivalent valuable consideration, excluding books and other publications intended for sale or distribution not exclusively or mainly for Malta, unless such provision is authorised by the Monitoring Committee in accordance with this Act.