PDF / .TXT malware analysis — malicious · 8c235f3b7d45116f

MALICIOUS

PDF / .TXT

4.0 KB

MD5: a3508bd72735b8d05eb2a49c6b74e234 SHA-1: 598ed1754add936b1d2563a8c9717163477b6d6e SHA-256: 8c235f3b7d45116f25add2097f092a6787700184333cca881b328ea6f4ae8641

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell 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 rules, along with the 'Script obfuscation indicators' in the static triage, suggests that the embedded JavaScript is heavily obfuscated and likely attempts to download and execute a secondary payload. The deobfuscated JavaScript file 'acroform_b64_00.js' is a key artifact. No specific family could be identified due to the obfuscation.

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` `b91e5094a51296037ffcd87eca592a5cba6f790c547108ff0a2e65d939cf84df`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6265 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` `74cbfdb1f3b26ad40c40be37226629fd91cfbea063d166ef2a9291b73b28ba74`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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