PDF malware analysis — malicious · f818ff56bea0c87f

MALICIOUS

PDF

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

MD5: bd256198de6f77331e0bf70445dd9808 SHA-1: 07fb65fb3bbaeb67aa255876bb0149c090279240 SHA-256: f818ff56bea0c87f2163c6424bdfc7111ba36fed1ab59b50fe1a479f8aa71423

86 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file 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 presence of JavaScript actions and streams within an encrypted PDF strongly suggests an attempt to conceal malicious activity, such as phishing or malware distribution.

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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