PDF malware analysis — malicious · 41802bb8410e43c9

MALICIOUS

PDF

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

MD5: 7302ce68b7df8ec774e2cc17d2a5cfff SHA-1: f1922dd115acf1090eb5fa961ff552eaa664a01f SHA-256: 41802bb8410e43c95f5f3bb8d738560ee611c7cd4ff9a212a4df12da80c119f5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named javascript_obj0001_000.js, is obfuscated and uses String.fromCharCode and eval(), suggesting it's designed to download and execute a secondary payload. The file's metadata and the presence of these indicators strongly suggest a malicious document designed for exploitation.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `2e39d5856494080867e9fd27c7f96099ec07bab15df73f4ca5818b3165d762d3`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	524 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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