PDF / .TXT malware analysis — malicious · b91b319aef02cdf0

MALICIOUS

PDF / .TXT

4.0 KB

MD5: c145222e3c986b987ea8663524c93d94 SHA-1: 92752f0ee62bcd6be6f4d78a9e4ed054def0d2f9 SHA-256: b91b319aef02cdf0384a7522d1c78fd5e9346d0d28b02992e22d117c3eda17b7

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 execution. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious artifacts. The primary function of the embedded script appears to be the execution of obfuscated code, likely to download and run a secondary payload.

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` `49069a54c7c991b4d769b86547d504050639a7c17dd7a185a305a7512f0e7695`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 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` `da5558f30456e917f99adf9e5aabba10c832fce64c8f33f9650cd17a2cca8555`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3571 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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