PDF / .TXT malware analysis — malicious · 58307530bb5c7158

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 239f1487674825cd028c945d1a1683b3 SHA-1: 75920f367b0221097f5afb89d5ab0d13c4f65b33 SHA-256: 58307530bb5c7158afac569fa42d7a25dfdc1b2bf1707ab0058a44496fd31552

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript code is being executed dynamically, likely to download and run a second-stage payload. The deobfuscated JavaScript stream, 'acroform_b64_00.js', is a key artifact. The exact functionality of the script is obscured, but the combination of heuristics points to a malicious downloader. Confidence is reduced due to the lack of specific URL or execution indicators in the provided evidence.

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` `f86112a6ebaa62a5317263f591f939ae06463fccf4325d596c40d34847c1b058`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6277 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` `2fa3325c5c7805b5865369b0f21e8d4f8a626c7603ee4bb04a0c2fbf795fb58e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3554 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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