PDF / .TXT malware analysis — malicious · fc1d9f35a837cd0b

MALICIOUS

PDF / .TXT

4.1 KB

MD5: d91094ac9acb18809bc72c6601102999 SHA-1: 64a02f34c22f4085b641b758c24d0fa0bb595bd4 SHA-256: fc1d9f35a837cd0bfbd6553fa2e268018819783bd9c893183ca17e01e979f927

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream utilizes eval() and String.fromCharCode, indicating obfuscation. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the presence of deobfuscated JavaScript. The specific download URL or execution details could not be fully reconstructed due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `6f206f7ea58ab534c3026bd1d7c6894968bdefcf1b6c116f346bf8cf32a1d516`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6349 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` `518fa52594bf48cdb9ddcb52ea807dd67dde397f0e48c56a687b60e43ebe19ca`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3607 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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