PDF / .TXT malware analysis — malicious · 3ec3e8aea47da9a0

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 12b8703eeaedde474ad80c5cb59c2f80 SHA-1: 6c584b442d71bf32a39d22ebcffc561412f5f64a SHA-256: 3ec3e8aea47da9a01c149afbc553e06ff4747117203f1b3018c1df73c92ccf96

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Script Execution T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings, along with the 'Script obfuscation indicators' in the static triage, suggests the JavaScript is intentionally obfuscated. This obfuscated script is likely designed to download and execute a second-stage payload. No specific family could be identified due to the obfuscation and lack of network IOCs.

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` `f01e1835aa76418ba35a9c039fbee85c4924e6af3c0a79a5d06e9f059b2ac92c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6365 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` `8c163715b4e7da5758f50a82b05ad3feb30cb9422ae0f085b326499cf7b499bf`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3620 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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