Many sites offering "free PES 2017 editors" bundle them with adware, browser hijackers, or worse. Always scan the downloaded file with an antivirus (like Malwarebytes or Windows Defender) before running it.
There is no official "BAL Editor" released by Konami. All available tools are developed by the modding community. Based on historical data and community archives, the following tools are relevant: bal pes 2017 editor free
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It could be a false positive, as many editors modify memory or save structures. However, do not ignore the warning. Upload the file to VirusTotal (web tool) for a second opinion. If 2-3 engines detect a threat, delete the file. Many sites offering "free PES 2017 editors" bundle