PDF malware analysis — malicious · d3c06f8ea6d3d849

MALICIOUS

PDF

1.95 MB

MD5: b8f0674a8d9e323252330494faea2330 SHA-1: 6ba3db3b617a796eb3ba61e013785cf516533116 SHA-256: d3c06f8ea6d3d84923ff7d9eef28dcac2e05d40bdaa8d0de6dbed7d64a09e7a5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' rules suggest the JavaScript is obfuscated and likely executes arbitrary code. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', are the primary artifacts, but their specific actions could not be fully determined due to obfuscation. The overall attack pattern is consistent with using a document to deliver and execute a malicious script.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `fdd9ed9298a8cbf3ffcc5cf62c512dfc5b9f8eded7fbf1a998e4007a1e811bec`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6417 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` `9845a08df791bb939136517374b177e7ec615017ce7a5199555c11ce173f31a1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3659 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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