PDF / .TXT malware analysis — malicious · 3a6d7038e18e5d1b

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 9cc758c22059a31626ee71ea1cdff40d SHA-1: 9b526dcc7aaf6714bb2953ac26eadd22d9a2812d SHA-256: 3a6d7038e18e5d1b5436a62eaeeeeb77154e6fa9b97d59a61aedb08955c33db1

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests the JavaScript is obfuscated and uses eval() to execute arbitrary code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a secondary payload. The obfuscation and use of eval() are common techniques for evading detection.

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_obj0013_001.js` `eb5a879020f166430f03b1febc3f085ec30909e18c57a1ef4ceb40e1e62e1b67`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6269 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `cd1e2a42d1feae97ea391403bb6d498d309f8c891fd5ffa2f2f975d2afce434e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3548 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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