PDF malware analysis — malicious · 621cddc36b44ca44

MALICIOUS

PDF

33.6 KB Created: f¥ð ÅS>ïû cJé3LÏB Authoring application: Ü`Âû<Àõ¾ÊM:?{ (via Ü`Âè<Àõ »ÊL:3{º)

MD5: a62df656ad4faf739ec64a144104c0ed SHA-1: c43b870e0564c15f72bb386c856ecd0a1e1817a4 SHA-256: 621cddc36b44ca4499ff4390d1365ca1cd53502d1db9d7b61ab0afbcece20d13

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file is encrypted and contains embedded JavaScript, which is a common technique to obscure malicious content. The JavaScript stream, named 'javascript_obj0009_000.js', is likely responsible for executing the malicious payload. The presence of JavaScript actions and encrypted content points towards a sophisticated attack designed to bypass static analysis.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `104f5a4443012abfe7c72677297d0a9a9ac5892bcd35e21638e6ecdc900c0484`	pdf-javascript-stream	PDF /JS object 9 at offset 0x3BE	31762 bytes

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