PDF malware analysis — malicious · 2a5529d8cead416e

MALICIOUS

PDF

17.9 KB Created: 2010-03-17 10:18:50 Authoring application: xN2nHR4YIjTlB (via TD80VyOgU70i)

MD5: 7cbb1c3181dc188a107f0113f7c9dfcb SHA-1: cedb876ce588b45511a3927d7503f54feffa5226 SHA-256: 2a5529d8cead416ed5ac056a1f4994a8ed7814193be2183d69263cc11dba46b7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named javascript_obj0007_000.js, is heavily obfuscated using String.fromCharCode and eval(), suggesting it is designed to download and execute a secondary payload. The exact nature of the payload cannot be determined due to the obfuscation, but the presence of these techniques strongly indicates malicious intent.

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_obj0007_000.js` `3cdd48e02e61003b649294b709cea56c77bd3beea707769725f5599de6820969`	pdf-javascript-stream	PDF /JS object 7 at offset 0x248	17120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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