PDF malware analysis — malicious · 4830f29276e08497

MALICIOUS

PDF

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

MD5: 5b4909792a97f81468f67ad59205e614 SHA-1: 36ee666695c2d68e6ffe8a39f66e694bd5e92ab3 SHA-256: 4830f29276e08497fb2bc6f8a124a41c7311bfb0fdd36725b74c41dfa6d47878

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by the use of String.fromCharCode and eval() calls. The embedded JavaScript stream, named javascript_obj0001_000.js, is likely responsible for downloading and executing a second-stage payload. The high confidence is due to the presence of multiple JavaScript-related heuristics and the explicit extraction of a JavaScript file.

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` `56f48941f64848dde3875ba7f416760642d079b483d00c4aea279767f7419abf`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	506 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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