I'm very confident that it is not a trojan, additionally, the file has been run for years without any issues occurring, and it is not just a random download from a random website. Having said this, is there anyone who can actually analyse the file? It's obfuscated, and I don't believe whoever commented originally knows what to do with that information, as they simply showed it was a trojan.
No malicious files were dropped, no processes manipulated and functionality wise it works exactly as expected with no hidden processes running in the background. So again, I highly doubt that this is a trojan and would like the file to be analysed to confirm this because it is very annoying that it is still being detected. Additionally, the file was not detected by your AV program until a week or so ago.