PDF / .TXT malware analysis — malicious · 236a0c1952e08e65

MALICIOUS

PDF / .TXT

4.0 KB

MD5: a346a792550ade228694e5799f4e1541 SHA-1: b698316130c270bd06c44ad5482d8b67e4b7298a SHA-256: 236a0c1952e08e6547dd2ae8d514c93f25b08bedaa94778f09b846d68046f812

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream (acroform_b64_00.js) likely contains code to download and execute a second-stage payload. The presence of eval() and String.fromCharCode() suggests obfuscation techniques were used to hide the malicious script's true intent. The extracted file names also point to JavaScript artifacts.

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` `c62a009f570a61abfa74d0297e513a86960ae50d909a3826f7556ba6d10e8c4e`	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` `bd4db46b413bcc8e03a27f7c4223b56e04e9fdf3f1e4f3113a03ec090abe4dde`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3602 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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