PDF_HIDDEN_HTML_IFRAME — Hidden HTML iframe in PDF

high PDF_HIDDEN_HTML_IFRAME

What it means

PDF bytes contain a zero-size external HTML iframe.

Why it fires

A hidden iframe pointing to an external URL is a browser exploit-kit or redirect/dropper pattern. It is not normal PDF structure, so the detector is high-signal while remaining cheap to evaluate.

Other PDF heuristics

PDF_LAUNCH_JS_PROTOCOL PDF_LAUNCH_COMMAND PDF_LAUNCH_MSHTA PDF_ADOBE_QR_UNLOCK_LURE PDF_JS_URL_KEYED_READER_EXPLOIT_KIT CVE_2009_2990_U3D_AUTOACTIVATE PDF_ANNOT_AUTHOR_EVAL_STAGER PDF_ANNOT_SUBJECT_HEX_EVAL_STAGER PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER PDF_JS_BASE_N_TOKEN_DOWNLOADER PDF_BASE64_PE_PAYLOAD PDF_BRAND_INVOICE_LURE_OFFDOMAIN PDF_BRAND_INVOICE_CLOUD_EMAIL_LURE PDF_CORPORATE_PRESENTATION_CLOUD_REDIRECT_LURE PDF_CORRUPTED_FILE_UPDATE_LURE PDF_CRACKED_SOFTWARE_SHORTLINK_LURE PDF_GAME_HACK_SEO_LINK_FARM PDF_DISTRIBUTED_PIRACY_LINK_FARM PDF_DOCUSIGN_DOWNLOAD_LURE PDF_DOCUMENT_ACTION_HOST_MISMATCH_LURE PDF_DYNAMIC_DNS_DOCUMENT_LINK_FARM PDF_SWF_NATIVE_MEMORY_CORRUPTION_PAYLOAD PDF_EMBEDDED_PE_PAYLOAD CVE_2010_1240_EMBEDDED_EXPORT_LAUNCH