PDF / .TXT malware analysis — malicious · 1d79917f6d8a38c3

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 60401e04076ab5f17eabd91deefc13e1 SHA-1: 8095b31b33d1526c9a7d2a8e29255fb23e5a0513 SHA-256: 1d79917f6d8a38c3be196ec07bae9fb05cd683b6708bc8fc17bf56a8f76a02bd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests code obfuscation and dynamic execution. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a secondary payload. The exact nature of the payload and its destination could not be determined due to obfuscation.

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` `8f79f0fdd3a03d378cff25cef2274a760c7594f15ad95f5e18b88fbf7d3db0e8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6385 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` `75d4f2dbec8774545cc1d321f9ddecf9df8bdf0ec6f81af5b7cc85b728aa4d35`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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