How does the article implement a file dropper using Node.js, and what techniques are used to reduce payload size?

The file dropper works by base64 encoding an executable file and storing the encoded string, then decoding and writing it back at runtime. To reduce the payload size, the author also demonstrates using gzip compression with `zlib.createGzip()` and decompression with `zlib.createGunzip()`, leveraging Node.js streams via `pipe()`. This approach is similar to techniques used in Volume Shadow Copy in Penetration Testing for stealthy file manipulation.