PDF malware analysis — malicious · 7c1911a9e48481d2

MALICIOUS

PDF

4.0 KB

MD5: d6b4e6788e0581199611dd3fbc60031d SHA-1: c0cbac1c4a977c373eafdf1d5e54cd858fdf14b2 SHA-256: 7c1911a9e48481d292004658320e13aad5d049ebac826960c24522ed93b1788c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated and uses eval() and String.fromCharCode(), suggesting it's designed to download and execute a secondary payload. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript file 'acroform_b64_00.js' was also extracted, further supporting the presence of malicious script content.

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` `504e0fe37b2ba0c20087710ce00900b6077ab096fb96b9969e0dea812077a171`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `30ed8dc936cc2aef07238eae623a9fcb1b1077d01f7622f3e50921deb140c0ae`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3599 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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