/usr/lib/ is in node-mqtt-packet 5.4.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/nodejs/
/usr/lib/nodejs/mqtt-packet/
/usr/lib/nodejs/mqtt-packet/.travis.yml
/usr/lib/nodejs/mqtt-packet/benchmarks/
/usr/lib/nodejs/mqtt-packet/benchmarks/generate.js
/usr/lib/nodejs/mqtt-packet/benchmarks/generateNet.js
/usr/lib/nodejs/mqtt-packet/benchmarks/parse.js
/usr/lib/nodejs/mqtt-packet/benchmarks/writeToStream.js
/usr/lib/nodejs/mqtt-packet/constants.js
/usr/lib/nodejs/mqtt-packet/generate.js
/usr/lib/nodejs/mqtt-packet/mqtt.js
/usr/lib/nodejs/mqtt-packet/numbers.js
/usr/lib/nodejs/mqtt-packet/package.json
/usr/lib/nodejs/mqtt-packet/packet.js
/usr/lib/nodejs/mqtt-packet/parser.js
/usr/lib/nodejs/mqtt-packet/test.js
/usr/lib/nodejs/mqtt-packet/testRandom.js
/usr/lib/nodejs/mqtt-packet/writeToStream.js