PDF malware analysis — malicious · c00b56b6aa864ace

MALICIOUS

PDF

32.7 KB Created: F6|åú){C!É[±QDB Authoring application: .Ô¸¨tK§Y (via .Ô¸¨~K§N)

MD5: e5be0236b0a96c8372612f5e773ca77b SHA-1: 3aba9d204341e7aa2c7046c94c5a1009cd318e66 SHA-256: c00b56b6aa864ace4a6e876e18a3bed83d6f5a2693f12ca337e5a04f8a41a656

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and exhibits characteristics of a malicious document. It contains embedded JavaScript, which is used to encrypt the PDF content, hiding the payload from static analysis. The presence of JavaScript actions and streams indicates that the document is designed to execute code upon opening, likely to download and execute a second-stage payload. The specific JavaScript object name is javascript_obj0009_000.js.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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` `52984a5d93131c111aaa90fae0f99971ee2dcfe9fe9bcd4aede3e6347452d0f6`	pdf-javascript-stream	PDF /JS object 9 at offset 0x3C7	30868 bytes

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