PDF / .TXT malware analysis — malicious · c339f18955c07758

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 41050b07c06f14538c198f82634f77c9 SHA-1: 0e065d3f9c50839803a41d00748a67d3b1116839 SHA-256: c339f18955c0775827a2bdab4d847bce0da30ecfc8429e12c451dccb5f247aee

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 'PDF_EVAL' firing specifically points to the use of eval(), a common technique for executing obfuscated JavaScript. The presence of 'String.fromCharCode' further suggests code obfuscation. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The obfuscation and use of eval() make it difficult to determine the exact payload or destination without further dynamic analysis, hence the 'unknown family' classification.

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` `9fc14751b06b5bd22ef823ac68c1ef33cf89211e6d92b526f988723dd1ef871d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6357 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` `6eed3d901b086aab767d0cb2b285fe728221063f6c9cff8df0d7d3866ef563fb`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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