PDF / .TXT malware analysis — malicious · dda2ca19d6f402e0

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 8e601b0f0ce7f1bd2b23e3e3ca40b368 SHA-1: 304e0ab021e920ea197af4c58e60017b48b7d64f SHA-256: dda2ca19d6f402e0bb8dbad5b1159b7d8fcb99d6b9db199072cd44b3add23de9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings, along with the presence of deobfuscated JavaScript files, suggest that the script is designed to execute arbitrary code. This is likely to download and run a second-stage payload, a common technique for initial access or further system compromise. The exact nature of the payload cannot be determined without further analysis of the executed script.

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` `3a1758f9ffd11d81f4188467cc581f107114d5c8bbfc15945b69112d37901321`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6341 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` `f1b2cd6fa3e107c09408c80ea103840c65fca8ded9ac756eff10ae42aea1a5ef`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3603 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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