PDF malware analysis — malicious · 5721f49ff9552713

MALICIOUS

PDF

1.9 KB

MD5: 2e4f35daa0c410a9b945a069f67c9cb4 SHA-1: 9b75885dc1f7d3c38e8373ec246d889e48754481 SHA-256: 5721f49ff955271350b339190b9d64e3728b02ea36161d77fcd4c94ad8b25f36

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, and PDF_EVAL. The JavaScript stream is heavily obfuscated using eval() and String.fromCharCode, making its exact function difficult to determine statically. However, the presence of these obfuscation techniques strongly suggests the script is designed to download and execute a second-stage payload. The obfuscated string itself is provided as an IOC.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `2e243f5a30a6643a2f3b22383da168c4d4e30d11f226defa1aadeadd03969e7d`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	1445 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `d66c367e046893fea36641d466ed2164cf56d7b821207a0f0dc3b57b285b1ee0`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	35 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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