PDF malware analysis — malicious · 4f335a4a8bd07238

MALICIOUS

PDF

2.7 KB

MD5: 5a10cbf28caf4098fb77e5e73c10b002 SHA-1: 02cf3ec4064e280344f973a459a2eb397e231108 SHA-256: 4f335a4a8bd072380fb30aacc772581cb44f0ec191f0ddb1c4f2da0ddd5fafe2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The JavaScript streams are obfuscated and utilize eval() and String.fromCharCode() functions, suggesting an attempt to hide malicious code execution. This pattern is commonly used by malware to download and execute further stages. The extracted JavaScript files, javascript_obj111711_000.js and javascript_obj111712_001.js, are suspicious due to their size and obfuscation.

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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `038d8edf68549b825002ded516c64a0ce56363dbfdaf74129ad5b0263d3d42fe`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `ba266f9f096dd753022553d891810f1b2b8791fe59f9344816d20634748ec63b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x247	3008 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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