PDF / .TXT malware analysis — malicious · f566f1889eb64322

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 2e50075690841653696eeeb69ffeaf66 SHA-1: c8803be560378e27437219522ad654f158b0b96a SHA-256: f566f1889eb64322d4343b1168dff2507418506de61ecb5f93d69d2eefccc52b

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 and PDF_JS. The high-severity PDF_EVAL firing, along with the use of String.fromCharCode, suggests the JavaScript is heavily obfuscated and designed to execute arbitrary code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for the malicious functionality, potentially downloading and executing a secondary payload. The confidence is moderate due to the obfuscation making precise analysis of the script's ultimate goal difficult without dynamic execution.

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` `297f70ae9cec06736956f4be0a680f2c6d9d04a9e3cad914ada079fccd5051da`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6361 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` `8aa42f853d39f84c7bee513b30212de62d64302ae2731859d0a9b2438e9ca365`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3618 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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