47. A computerized method, comprising: examining, by a parser executed by a hardware processor, one or more portions of a Portable Document Format (PDF) document to determine if one or more suspicious characteristics indicative of malicious network content are included in the one or more examined portions of the PDF document, wherein the one or more examined portions of the PDF document comprise less than an entirety of the PDF document, and upon the one or more examined portions of the PDF document being determined to include one or more suspicious characteristics indicative of malicious network content, receiving the PDF document by one or more virtual machines to process at least the one or more examined portions of the PDF document so as to determine whether the PDF document includes malicious network content.
47. A computerized method, comprising: examining, by a parser executed by a hardware processor, one or more portions of a Portable Document Format (PDF) document to determine if one or more suspicious characteristics indicative of malicious network content are included in the one or more examined portions of the PDF document, wherein the one or more examined portions of the PDF document comprise less than an entirety of the PDF document, and upon the one or more examined portions of the PDF document being determined to include one or more suspicious characteristics indicative of malicious network content, receiving the PDF document by one or more virtual machines to process at least the one or more examined portions of the PDF document so as to determine whether the PDF document includes malicious network content. 50. The method of claim 47 , wherein the examining of the one or more portions of the PDF document excludes from an examination of at least one of a header, a cross-reference table, or a trailer of the PDF document prior to providing the PDF document to the one or more virtual machines.