PDF / .TXT malware analysis — malicious · c99c83aecc0066d9

MALICIOUS

PDF / .TXT

4.1 KB

MD5: e02c686a7d56901296734a79cf92f331 SHA-1: 11da0decb58353cdb9ff12c594aec077c8d204cb SHA-256: c99c83aecc0066d955acbb8a3974c16d1ae0399d90aea65f82ddddc96cb835b5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF 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 likely executes arbitrary code. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', are the primary artifacts responsible for the malicious behavior, likely downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `93338bb0372c2f0e49799b0d8d6e4626a68fbce751611fe3e7527deb9821dc9d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6317 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` `3f10a60cf04a0ebe28fc62d11b4b805423f833e87c5b61134a998edb9aa416c1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3583 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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