PDF / .TXT malware analysis — malicious · cd48ad2903bf646b

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 246dd4c1e47b2f2d78541e713efd5a8d SHA-1: 878642540bea1b9ed6c4b023c997df860aa22295 SHA-256: cd48ad2903bf646b76ddcab87fe557590fef6b1da6ab902240061dc1f99fb61f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing eval() and String.fromCharCode(), as flagged by PDF_EVAL and PDF_FROMCHARCODE. The deobfuscated JavaScript, found in acroform_b64_00.js, likely attempts to download and execute a second-stage payload. The presence of obfuscated scripts and the potential for remote code execution suggest a downloader or droppper functionality.

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` `801b664384ad150c59347a148556a5ae111bcbcdc82f4a4b892ce2c0e8b0d17b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6377 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` `cc3be34b93413c350d1a23eb5d66d8b1788bb90dc325051e97ab8556fb89fe7a`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3628 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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