PDF malware analysis — malicious · d510b226c96547aa

MALICIOUS

PDF

42.5 KB Created: ¤O_ TF013½G0240üòy:Z7¡r013A

MD5: 257d529687c04afe2f4df713ba2c251d SHA-1: 74c95057bc51a52b38d431aa2c519e2b1f583d55 SHA-256: d510b226c96547aa039e343eb797060a5b3fae1ba92f8c256b32958f78656ec6

88 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF was flagged as malicious by an ML classifier and heuristics indicate the presence of JavaScript used to hide content. The JavaScript stream, though not directly readable, is the primary indicator of malicious activity within this document. The obfuscation technique suggests an attempt to evade static analysis and deliver a payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0021_000.js` `1c9a235da2dfb3f0d61f116652e47b3479b7b83f24f6ef27aeeed3d187e6ba1f`	pdf-javascript-stream	PDF /JS object 21 at offset 0x1782	138 bytes

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