PDF malware analysis — malicious · b58b4bece0bf6df1

MALICIOUS

PDF

2.6 KB

MD5: 02bc4321c072f53f2301f1eadc3695a4 SHA-1: 7b3dd2e19116883f0020fd7244d6223bf5afc21d SHA-256: b58b4bece0bf6df1bf274db822b5cd2a4b8aecd2d5f08cf4f2f3ae1bb136d62b

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call and String.fromCharCode usage suggest obfuscated code execution. While the exact payload is not clear from the provided evidence, the presence of these indicators points to a malicious script attempting to exploit the document. No specific family could be identified.

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` `417f7a09e0fa243f0ceaf33f75e2a8d3051dc93618b552a614c3df2f07a6981a`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2593 bytes
`javascript_obj111712_001.js` `1398eb2af9e6a1ec7a8c54604955f047dfc4edeb74254a4e41c9b7e7ad6002b6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x89E	544 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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