PDF malware analysis — malicious · 3257f230cc03aaa6

MALICIOUS

PDF

4.3 KB

MD5: a7f66bf5b349e4957df45ca26aec77e1 SHA-1: 1a0581a25474ac95ee741cbb1b753c6a09ce6888 SHA-256: 3257f230cc03aaa6ab454dd0cbd92b3e9995417134e903af8b557da5505336c5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to dynamically construct and execute code. This script is likely responsible for downloading and executing a second-stage payload. The extracted artifact 'javascript_obj795218_000.js' is also noted as suspicious due to script obfuscation indicators. Due to the obfuscation, the exact payload and delivery mechanism cannot be definitively determined.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj795218_000.js` `15148fe36dffdf80a5fb3a3c8c525b191dc9aa161dc527b383f7514f89095019`	pdf-javascript-stream	PDF /JS object 795218 at offset 0x138	8330 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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