PDF malware analysis — malicious · e77aa084198488df

MALICIOUS

PDF

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

MD5: 94dcaa2e5ebecfaf5666c2f59d408507 SHA-1: ed077d6717935602d6080bdf0e4e9366947a8a17 SHA-256: e77aa084198488df2fed19d24280f96c5ef48d799ebe2034629dceeb0f79eb96

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The 'String.fromCharCode' function is used, indicating obfuscation. The JavaScript is likely used as a stager to download and execute a second-stage payload. The presence of 'String.fromCharCode' in the DOC BODY further supports this. No specific malware family could be confidently identified.

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` `fccfa8a74bd9dffbde1b1c32d96f16f1ee3590633b2c86c797cc0cdffc35f424`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62D6	512 bytes

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