PDF malware analysis — malicious · 21f41c5ede58fcbd

MALICIOUS

PDF

3.8 KB

MD5: c3712f0e51633dd8790053033e77a2ea SHA-1: e454f0544be5d442f7cce7c7b54024104c89dbe6 SHA-256: 21f41c5ede58fcbdb063f7021a566a8e52f99a89ae2c3eaefb7716d09add1745

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. One of the embedded JavaScript files, 'javascript_obj111712_001.js', is particularly suspicious due to its small size and the presence of obfuscation indicators. This script is likely responsible for downloading and executing a secondary payload. The PDF structure and the nature of the embedded scripts point towards a common delivery mechanism for malware.

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` `c6aaf0019fa752cd430740b1b84ce929df84ffe6a9220fa7122dd0decce067b1`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	4791 bytes
`javascript_obj111712_001.js` `1c2900c173db8358acb575a49bf49c2a81d900015748963f6afa371317750e3d`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD24	515 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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