PDF / .TXT malware analysis — malicious · e9777a869a1c91c9

MALICIOUS

PDF / .TXT

4.1 KB

MD5: ca04af21fb03e5af2e59f53a6bd49617 SHA-1: ebe8b3e94d86c892bdba287bc72ddfac49e1ea8a SHA-256: e9777a869a1c91c9b5a10ac5283fff35a6ab891804a460293ae0c47cba9a530a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute its code. The deobfuscated JavaScript file 'acroform_b64_00.js' likely contains logic to download and execute a secondary payload. The presence of these indicators leads to a moderate confidence assessment for an unknown family.

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` `873e1f389fe8cc189ca2ffa3441141b246732a963cbbd57811e97cd7d8419478`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6369 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` `4eb5fac78a6fe11f8f6c8f2c4a91a988b55af24bb23c6a9986aed65b12b8729d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3622 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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