PDF malware analysis — malicious · 0484886b89697530

MALICIOUS

PDF

34.8 KB Created: ÏÖÚ^ßaeÐËl9ò{2÷ÏË^;Òq Authoring application: uè-îÉQ7á^Æ!° (via uè>îÉQ=á^~Æ-§ä)

MD5: f72935f6d005f729b44f3523e6fb4780 SHA-1: 1eb730c7f276b8765c4e2c5f294044d1603c2839 SHA-256: 0484886b896975302a1a90d598c1ad0410f075a2f08e4597bdb3d7bcbad5474c

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript is obfuscated but appears to be responsible for decrypting and executing malicious content, likely downloading a second-stage payload. The presence of JavaScript actions and embedded JS streams strongly suggests T1059.007 (JavaScript) as the primary technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 4

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.
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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `fb4f5db68d2a63206c46cc0babc400a50cf52691c09c17e3e74066e14d6e22c1`	pdf-javascript-stream	PDF /JS object 8 at offset 0x4EE	2047 bytes
`javascript_obj0009_000.js` `f984393c023eaf77ed3363762ef77b271ce69a4b6e0c8d123c8b12e13d6dcfaa`	pdf-javascript-stream	PDF /JS object 9 at offset 0x3DC	32894 bytes

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