PDF malware analysis — malicious · f308337fc9ea2fa8

MALICIOUS

PDF

40.4 KB Created: 7Qb]Ø(ºô¹Ä¡§ßÁÜ³2 Authoring application: Àc'èZëÆý®ß§ (via Àc'èPîÆü®Ó§å)

MD5: cfb214d2e3cc3457c572057b87b394c0 SHA-1: e8b6879cd60f8a8c040260420ef9c7b7a397e10e SHA-256: f308337fc9ea2fa8c517e75ed07fbdd07eb6345d2dbe970e2ba45c51182ca851

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file is encrypted and contains JavaScript, which is used to obscure the malicious payload. The embedded JavaScript object, javascript_obj0009_000.js, is likely responsible for executing the malicious content. The presence of PDF_JAVASCRIPT and PDF_ENCRYPTED_WITH_JS heuristics indicates a deliberate attempt to hide the payload from static analysis, suggesting a downloader or dropper functionality.

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` `e4d374fa42df68c52df51b21036599ef90ce09c72047537e45967d74c9f901f8`	pdf-javascript-stream	PDF /JS object 9 at offset 0x3D7	38624 bytes

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