Delf is a large family of malicious programs, many of which are associated with data theft.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
Individual variants in the family have varying characteristics and payloads (terminating processes, stealing data, downloading other malware, etc). Some variants differ so significantly that they are classified as Worms or Viruses, rather than Trojans.
For representative examples of Delf variants, please see the following descriptions:
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