PDF / .TXT malware analysis — malicious · 99f43c4e350a2321

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 866d629a302c38dbbd2fe93e6345ea14 SHA-1: 72362de619a90df6c4631b82b201efecb394ed8e SHA-256: 99f43c4e350a232168bc053cd050412edd95216428fd269300b2cc5db13aee6d

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 JavaScript stream exhibits obfuscation, including the use of eval() and String.fromCharCode(), as flagged by PDF_EVAL and PDF_FROMCHARCODE heuristics. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a secondary payload. Due to the obfuscation, the exact nature of the payload and its ultimate destination could not be determined with high confidence.

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` `0d27d7c3480deb616c7cc74d8d17296959115466cc0c8db1cbdac1b557984bc0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6209 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` `b026d07fcf77479d1cf2c83754bdfc477384ae92866ed1fdaf868cc73c3d1008`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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