PDF malware analysis — malicious · 9a2c76cb2e258f86

MALICIOUS

PDF

267.4 KB Created: + Å×}·qQ¼EûªG©°7q

MD5: 1a67d8b8b1d10d3460596b93d0803484 SHA-1: 6f66ab80566f3d0fea8dab465922c0fe81134b75 SHA-256: 9a2c76cb2e258f86669edba7b86ac319fea6c6b03f3a029643da9c73d8e81ba2

124 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript is obfuscated and likely used to conceal the malicious payload, as indicated by the 'PDF_ENCRYPTED_WITH_JS' heuristic. The embedded file 'bxT' is also suspicious. The combination of these factors suggests the document is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9939

Heuristics 7

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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`bxT` `385c32298e33117c4b81f8de50f227acd69a1ca4690971b7d0d94193c7a5cae5`	pdf-embedded-file	PDF EmbeddedFile object 50 at offset 0x3B0E	2376 bytes

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