PDF malware analysis — malicious · 6bbc4ddc770e0f88

MALICIOUS

PDF

31.47 MB

MD5: 427503a469a220f4f53b0a5057c89d91 SHA-1: 1f8dd65fe53119bb818ab56e0da4eadb6abc1927 SHA-256: 6bbc4ddc770e0f8841f478067d1d33c2d51ae6eafae50f50d9d92a95e4a51b16

122 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript, which is often used to hide malicious content or download further stages. The presence of PDF_ENCRYPTED_WITH_JS and PDF_FILTER_HEX heuristics indicates attempts to evade static analysis and conceal the payload. The JavaScript action and embedded JS stream strongly suggest the document's primary function is to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 6

Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures

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