: Upload the hash (MD5/SHA256) of the file to VirusTotal to see if it has been previously flagged by security vendors.
If you must observe its behavior:
To look "deeply" into this file without executing it, you should use the following professional techniques:
: If the binary is a .NET assembly, tools like dnSpy or ILSpy can reveal the underlying source code. For native binaries, Ghidra is an industry-standard open-source tool for reverse engineering and decompilation.