PDF malware analysis — malicious · 4cf76bb10aa49317

MALICIOUS

PDF

4.0 KB

MD5: b3c46569a53e4fa2dce97716b2842e0b SHA-1: c87111c2e68ac7c2ce3969b3baeca7d923dbd07b SHA-256: 4cf76bb10aa49317fa726a4bd8c26d1df379bdc1eb07d0a2fe175cc97c082942

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, one of which is heavily obfuscated and utilizes eval() and String.fromCharCode() functions. This indicates an attempt to hide malicious code execution, likely to download and execute a second-stage payload. The presence of multiple JavaScript objects and the use of obfuscation techniques suggest a downloader or droppper functionality. No specific family could be identified due to the 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_obj111611_000.js` `7d620d882e62d5546013f7e54f168448ffda1903ef0dfad24b48338180763ba1`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `e2a04851f5fe9442694a6ab56fdc551928ce492d5c5e27cd6b002bcb7ee4eae3`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5638 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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