PDF malware analysis — malicious · 77d15e545c351522

MALICIOUS

PDF

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

MD5: 45119f026d5ea0b91da60c67c5ffb5e0 SHA-1: 731063076671afc0b71d77af43dcef03174c7664 SHA-256: 77d15e545c3515225f3549a57e48bcd7e860c1cdd2f348dcdd731e4c077acb32

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple PDF-specific 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 presence of these techniques and the obfuscation points to a malicious downloader.

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` `35448981f2d46ee9a0575e3d9c4ea1eb907fc676f0e269f83f754b1a3cf180d8`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	529 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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