One day I came across a bug in the HR platform and able to see everyone's pay inside the MNC.
I was furious after looking at it and found out I'm the lowest pay among all my peers of the same level despite me handling more projects than them.
To add salt to wound, the one slightly younger than me also got few hundred higher than me.

I noticed 1 thing is that, if somebody is paid high, it is very high; conversely when someone is underpaid, it is ridiculously low.
One example is Controller normally is 10k and above, 1 of them got paid a shockingly low amount at 5.5k. This person joined the MNC few years ago, while the rest of his peers hired recently all got 9 to 10k. All same experience and capability.

As for me, my pay difference compared to my own peers can be as much as 2k. My pay is still above average if want to compare to most Malaysians, but as a professional that puts in effort on work but get paid unfairly low is like an insult to me.

So I decided to handpick a few colleagues that got affected by this unfair system and told them directly where they stand in the pay ranking.
I think this caused quite a few people resigned right away.

It's been 7 months now I'm serving another company with astronomical pay raise, suddenly I received a call from ex-colleague that is still inside that MNC and informed me that now the rumors have spread far enough to reach the top managements' ears, and now they are serious about investigating this matter, that ex-colleague is worried if anything is going to happen to me or not. It's a bit funny that the uproar only happens many months after I resigned and left.

On my last day in that MNC I did cleanly delete all files that even has a 0.1% chance of hurting me, and delete all chats.
I did not circulate the leaked salary file too, I only verbally let them know about it.

What are the chances of that MNC actually take action against me? Receive legal better? What is my worst case scenario?

Not sure if they want to spend such money to hire lawyer just to get back to 1 staff, plus i didn't hurt the company business or whatever, just that it caused some resignation of few staffs, they might be also planning to leave anyway, could be not due to my leaking. If you want to pinpoint, you can say i disrupt the back end professional services, not the major business. Back end always replaceable and not key staff.

As far as I'm aware, whether i delete or not, after laptop hand over back to IT, they will format it in 2 days. All data will be wiped clean anyway. I didn't keep traces in email at all (no source to begin with), so even if they somehow go into my email and check, it's fine. I got the file thru other less known channel.

For that phrase that doesn't make sense to you, i meant to convey that no one actually got hold of the file itself, so there will be no concrete proof, the info is only coming from me verbally.

Don't know why you're so sided with the company, yes technically they didn't cheat me, but it's not like i got a choice, i was in bitter position in my ex company and so happens this mnc passed all my interviews and accepted me, they didn't give me what i asked for, but still an upgrade in salary, that stupid hr low key low balling me that caused this scenario 2 years down the road. It's harsh if the starting point is low enough, every subsequent increment will also be low because it based on basic. You been paid fairly your whole life?