PDF malware analysis — malicious · e961ebf41cd7fbdb

MALICIOUS

PDF

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

MD5: 670da52dc3ba4d101a60338acb9eca79 SHA-1: 8a116a4d8e6686ce938e3b86670118cfb7afc6ee SHA-256: e961ebf41cd7fbdb26a6e76ff5e43742c418e6bbed30ebb046798b55fc828f61

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The JavaScript uses 'String.fromCharCode', suggesting it is obfuscated. The primary function appears to be a stager, likely intended to download and execute a second-stage payload. The document body is minimal and does not provide further context on the lure.

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` `f0539bd5df5119be96e97a932c56b1bd09e99efb922770b8fb75205a15c935b3`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6280	519 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.