PDF / .TXT malware analysis — malicious · d3906962e77e8fff

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 1ba08542541eb5ad0a8b3f2b4e8b923c SHA-1: b314cb8e74e0edfb025eb492eed51fced15d6e4f SHA-256: d3906962e77e8fff351d50e7a0bbf03674f212df241c94b22904aebcccb75a30

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The deobfuscated JavaScript file 'acroform_b64_00.js' and the embedded 'javascript_obj0013_001.js' are the primary indicators of this malicious activity. The obfuscation indicators and the use of eval() point towards a downloader or dropper functionality.

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` `63f54d9b598ccf7668bb219c6a2b9f2377c66a14a9ac06633e192a802a76bbcd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6373 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` `1b9e6ef92e25aa524d75b661671b28e150f5e81fa3bb2f150e562c5c844b4ea4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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