I'm pretty certain that corrupting a character by sending too much cash to it is impossible (this isn't exactly the same as it being actually impossible).
It was possible in the past but changes have been made to prevent this. In addition, cash transfers are logged so if someone intentionally corrupts another player's account then action can be taken against the instigator.
If anyone wants to try, feel free to send lots of cash to my primary ship - the Flyin'Brick. I prefer small unmarked bills in 10K credit bundles, but any amount up to 1,900,000,000 will be fine too. Should you succeed in corrupting my account, then I'll be very grateful and return the money - should you not succeed then I'll enjoy your money and still be very grateful.
Proud member of "the most paranoid group of people in the community"