PDF malware analysis — malicious · a411bc2dc57b1966

MALICIOUS

PDF

3.8 KB

MD5: 155df2d6219f3a811c6c1fea90e74238 SHA-1: 9ddb9dce6c092bb13382802e7056374b7ffacfb8 SHA-256: a411bc2dc57b1966ba7e44bcb1b10eb509c8207334b3f2666978f3b11a85e27f

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 file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The presence of eval() and String.fromCharCode suggests obfuscated JavaScript code is being executed. Two JavaScript files were extracted, which likely contain the malicious payload. The exact intent of the script cannot be fully determined due to obfuscation, but it is highly probable that it downloads and executes a second-stage payload.

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` `07a09ad00f86ac37d0dded5e96e96819a0bd3e092338343b5bbadd45a7305378`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	370 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `c828db1f2f986736b4a85b255d48fa822fca5e0060bd0a7f47712265693c8812`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x246	5212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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