PDF / .TXT malware analysis — malicious · 3779ef11db66e437

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 90881221b179610ae7f17b1c37126033 SHA-1: a0d9ce2730c56411eb73cdce66ef69b6530fc271 SHA-256: 3779ef11db66e437d6d57181a4ea384a42a5619031df038fc037739519a2cbf9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript, found in 'acroform_b64_00.js', likely contains code to download and execute a secondary payload. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscation techniques were used to hide the script's true functionality. The extracted artifacts 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are suspicious and warrant further investigation.

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` `6ae8713144441c55e249055c90ef89bf1daa33cad045c272f75bf5498568df84`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6405 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` `1d6b4957e6d54cd6916740c39543653b799013aa00ed47ce045011c3e50f2042`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3650 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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