PDF malware analysis — malicious · 37180dc45fc6ea3f

MALICIOUS

PDF

22.32 MB

MD5: 3a3309a1df3dbfa8693ae7a597e0fff3 SHA-1: ce31f9463584f055539a29ce3a28de3cc782906a SHA-256: 37180dc45fc6ea3ff357acc69b237f10afbe1fab2e6ac2967321569818b9878d

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF was flagged as malicious by an ML classifier and contains JavaScript actions and embedded JS streams. It is also encrypted with JavaScript, indicating an attempt to conceal its payload. The presence of PDF_ENCRYPTED_WITH_JS and PDF_JAVASCRIPT heuristics strongly suggests that the embedded JavaScript is responsible for executing malicious code, likely to download and execute a second-stage payload.

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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