free online virus scan .pdf

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Online tools: virus scan

Antivirus and malware check
software is used to prevent,
detect, and remove computer
viruses, worms, trojan horses and
spyware (malware in general).
Examples of anti-virus software
is the open source antivirus engine ClamAv, employed by the fre online virus scan of FindFiles.net.
A variety of strategies are useful. Signature-based detection involves searching for known patterns
of data within code (executable). However, it is possible for a computer to be infected with new
malware for which no signature is yet known. For these cases heuristics are employed One type of
heuristic approach, generic signatures, can identify new viruses or variants of existing viruses by
looking for known malicious code, or slight variations of such code lines, in files. Some antivirus
software can also predict what a file will do by running it in a sandbox and analyzing what it does to
see if it performs any malicious actions. If the antivirus software employs heuristic detection,
success depends on achieving the right balance between false postitives and negatives. Neutrals
actually do not occure.

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