PDF malware analysis — malicious · 563d0a51136fd7c3

MALICIOUS

PDF

42.2 KB Created: 025Î007k02126\*Kr027G +p.à026¸4¿ Authoring application: 020G4CkÉ'(023>L006±& (via 020Z9D*üd037t030+WT©)

MD5: cce38e756a8007601e257e8c9bb804fe SHA-1: 639ef57099cd763e4c364f56f662048e2053dede SHA-256: 563d0a51136fd7c3d185986bfce5711311bb576e3f76c88a37f741094cb512e6

86 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is likely used to obfuscate and deliver a malicious payload, as indicated by the 'PDF_ENCRYPTED_WITH_JS' heuristic. The exact nature of the payload could not be determined due to obfuscation, but the presence of JavaScript points to a common delivery mechanism for malware.

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` `b5a1bd36953296eb5bb2fe15220685df0ed9a24de9251856de062aa06b219f26`	pdf-javascript-stream	PDF /JS object 21 at offset 0x17BE	96 bytes

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