PDF malware analysis — malicious · 47460ebbe9fe63f1

MALICIOUS

PDF

10.8 KB Created: 2010-07-28 13:00:19 +04:00 Authoring application: Q__84Ew (via 32493)

MD5: ea9fd9c713cdbf8efd15e4f8976748a5 SHA-1: de0349cd6f582b432d6404a3df3573f571824f51 SHA-256: 47460ebbe9fe63f1da0db137e6f2e2747e85c30424be350d9bdd1b7c08096717

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'ML_NYX_PDF_MALICIOUS' classifier also strongly flagged the file. The JavaScript streams, particularly 'javascript_obj0011_000.js', likely contain obfuscated code designed to download and execute a secondary payload. The use of 'eval()' and 'String.fromCharCode' are common techniques for obfuscating malicious JavaScript within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `45aa6c18a6adda442a7e83990663a369016e8da74c6146ec12fb41b009b9c094`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23DB	504 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bcba5e4f4026cf2279324908a65bb249ef15e48842db1a8f6f43f01a549eab64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2541	193 bytes
`javascript_obj0015_002.js` `c535ca5170dbe1d420cb208b84be803ebe3a110198f272107867d52b9b9d5af1`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2642	45 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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