PDF / .TXT malware analysis — malicious · c7d39e74da5c7fdd

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 71faadeeb6aad99c04a23ab8e261ea2e SHA-1: 0bdaf69c25b3e52b8a389b77bb9724ffd4d4a7c1 SHA-256: c7d39e74da5c7fdd844e4d9d66d258a4ff6a922cc525b6a690d485f553fb7b9c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is further obfuscated and uses eval() and String.fromCharCode, suggesting it's designed to hide malicious code. The presence of deobfuscated JavaScript files like 'acroform_b64_00.js' and 'javascript_obj0013_001.js' points to a downloader or dropper functionality. The obfuscation and use of eval() make it difficult to determine the exact second-stage payload without further dynamic analysis, but the intent is clearly to execute arbitrary code.

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` `9e0ee3cb3091d0bbd023a33fefb1adebe92fa0f9a1330c36db943fb4c62cffae`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6313 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` `dd0e00a2b638534e9617470d8e6233cc36f016eeb742e308fc5710cfc7a78cde`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3580 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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