Security researchers often use numeric labels for samples. Reports from platforms like Joe Sandbox indicate that files labeled with similar numeric identifiers have been linked to:
Malware that "sleeps" to avoid detection by automated scanners. 22564.rar
Notes on its ownership by Muhammad Bakhit al-Muti'i and its eventual endowment to students at Al-Azhar University. 2. Scientific & Biological Data Security researchers often use numeric labels for samples