PDF / .TXT malware analysis — malicious · cb2f00868c254913

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 0412e14de6d74a6591a7f05e9161bc85 SHA-1: 1dde2e78bcedfadefc25e4bb26e37cef2d44b431 SHA-256: cb2f00868c254913ad4197812a718a6d22a099f24ac1e05b8bff9c50c5fe4f21

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple PDF-specific heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_FROMCHARCODE'. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic further flags 'Suspicious extracted artifact' with 'Script obfuscation indicators'. The JavaScript streams, named 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for executing malicious actions, such as downloading and executing a second-stage payload. The obfuscation makes it difficult to determine the exact payload or destination without further dynamic analysis, hence the confidence is moderate.

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` `ed203442ce7cd4ca918ebbe22e03660303b84d41ae5316a4b65846a958a9ef87`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6309 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` `b83dbe189c0ca47703620afabb006e37172e22ac188da87a5e8d572ed3d15181`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3577 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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