PDF / .TXT malware analysis — malicious · ed1d219f5a23906f

MALICIOUS

PDF / .TXT

4.0 KB

MD5: f62fb44ebb1adb353774403adf6c3bee SHA-1: 13507494550af082e2a494df281b1c27d1f54ea2 SHA-256: ed1d219f5a23906ffc390650731df2a36f989df593587d079970d8812585693e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The presence of obfuscated JavaScript streams, specifically 'javascript_obj0013_001.js' and 'acroform_b64_00.js', suggests the intent is to download and execute a second-stage payload. The exact nature of the payload cannot be determined due to obfuscation, but the overall pattern is consistent with a malicious PDF dropper.

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` `77ead67c41280766f5543a817326ab114dfdd5eadb9308c000f649fccc634433`	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` `0b94b81951246a5f87f98630609c520d105c041049839eddae73492b4331f664`	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).

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