HP saw the first lawsuit over its Autonomy scandal filed Monday in a federal court in San Francisco.

In the civil lawsuit, an investor has accused the company bought the analytics-software company in 2011 knowing that it had unreliable financial statements but withholding that fact from investors, according to a report by Reuters.

Last week, HP announced that it would write down US$8.8bn in company value, attributing the bulk of the sum to improperly valued Autonomy deal. HP accused some members of the subsidiary’s former management team of fraud, saying they had knowingly inflated revenue from software sales.

Another accusation Monday’s lawsuit made against HP was that it had kept quiet about its alleged attempt to get out of the $11.1bn acquisition before it closed because of issues with the British software firm’s accounting records.

The acquisition of Autonomy, whose flagship product is an unstructured-data-analytics technology, was spearheaded by HP’s former CEO Leo Apotheker, who was booted out of the company in September 2011 – the same month the deal closed.

As part of her company-wide restructuring, HP’s current CEO Meg Whitman (Apotheker's replacement) fired Mike Lynch, Autonomy’s founder and former CEO.

Responding to the announcement last week, Lynch denied HP’s accusations, laying the blame on the Silicon Valley giant’s internal politics and its mismanagement of his brainchild.

Apotheker also commented on the news, saying he was shocked by it and pledging full support to HP’s investigation.

HP reported $120.4bn in revenue for fiscal year 2012 – down 5% from the previous year.