PDF malware analysis — malicious · f2edec725bbef694

MALICIOUS

PDF

27.75 MB

MD5: ddb6c67914cf3abb20d811950b9f332c SHA-1: 96e296c943b1426f891c7476d8e77c6cf708a536 SHA-256: f2edec725bbef6943f10eaba45dbe448e573c19775f9d896a1cd224b473c2f75

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file was flagged as malicious by an ML classifier and exhibits several high-severity heuristic firings related to JavaScript execution and encryption. The presence of PDF_ENCRYPTED_WITH_JS indicates that the payload is hidden from static analysis and likely executed via JavaScript. The PDF_FILTER_HEX heuristic also suggests potential exploit indicators. The document body was unreadable, but the combination of these factors points to a sophisticated delivery mechanism designed to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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.)
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

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