PDF malware analysis — malicious · cc53b96be0c91671

MALICIOUS

PDF

25.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 679e3aafa6aa0451a91c17fbbf41ed5c SHA-1: 62ad22daa34de419f38f57d3d94a995d975b4059 SHA-256: cc53b96be0c916714ca692ba1bbbffb707ec51bf8a51f390e8628375b42869f9

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, specifically identified as a 'PDF metadata JavaScript eval stager'. This technique, along with the use of 'String.fromCharCode', suggests the JavaScript is obfuscated and intended to decode and execute a secondary payload. The presence of JavaScript actions and streams further supports this. Without further deobfuscation or execution, the exact nature of the payload remains unknown, but the stager mechanism is a common precursor to downloading and running malicious code.

Heuristics 4

PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `fa91e926a9a5ca51ff9fd4878d68cb66cbed3f0659e395e281b619f0fe747198`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61A2	455 bytes

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