PDF / .TXT malware analysis — malicious · 2630d307d22040dc

MALICIOUS

PDF / .TXT

4.1 KB

MD5: cb9ff9cf42963ac4182d2a325bdf404d SHA-1: 5dd4761253b65a6e05b6323519992c426f13cb0d SHA-256: 2630d307d22040dcb986c7b42b0bc974db217699e6145f068690952acef92c32

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings, along with the presence of deobfuscated JavaScript in 'acroform_b64_00.js', strongly suggest that the script is designed to execute arbitrary code. The extracted JavaScript files themselves are the primary indicators of malicious activity, likely serving to download and execute a second-stage payload. The obfuscation and use of eval() point towards an attempt to evade static analysis.

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` `81778b1397de6562cfdbf9bf4e23a2d8ca7513e25073a84b6040c933c46641f1`	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` `138f3d421ce0d574a68806a6b0e36efdec22519b51dcb0f74cb7c454d43deab5`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3651 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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