11. A system for identifying potentially malicious singleton files, the system comprising: at least one physical processor; and a system memory having stored therein one or more computer-executable instructions that, when executed by the at least one physical processor, cause the system to perform the following: identify a set of benign singleton files and a set of malicious singleton files; obtain, for each singleton file in the sets of benign and malicious singleton files, file identification information that identifies the singleton file; use the file identification information of the singleton files from the sets of benign and malicious singleton files to train a classifier to classify unknown singleton files; detect an unclassified singleton file; analyze, with the trained classifier, information that identifies the unclassified singleton file; determine, based on the analysis of the information that identifies the unclassified singleton file, that the unclassified singleton file is suspicious; and trigger a security action in response to determining that the unclassified singleton file is suspicious.
11. A system for identifying potentially malicious singleton files, the system comprising: at least one physical processor; and a system memory having stored therein one or more computer-executable instructions that, when executed by the at least one physical processor, cause the system to perform the following: identify a set of benign singleton files and a set of malicious singleton files; obtain, for each singleton file in the sets of benign and malicious singleton files, file identification information that identifies the singleton file; use the file identification information of the singleton files from the sets of benign and malicious singleton files to train a classifier to classify unknown singleton files; detect an unclassified singleton file; analyze, with the trained classifier, information that identifies the unclassified singleton file; determine, based on the analysis of the information that identifies the unclassified singleton file, that the unclassified singleton file is suspicious; and trigger a security action in response to determining that the unclassified singleton file is suspicious. 15. The system of claim 11 , wherein the file identification information that identifies the singleton file comprises at least one of: a filename; an inverse of the filename; a file path; a size of the file; a file header; a file entropy; an external library that the singleton file uses; a function imported by the singleton file; a computing device on which the singleton file resides.