PDF malware analysis — malicious · ee5313a5f4bb9dd9

MALICIOUS

PDF

11.5 KB Created: 2010-10-31 02:29:03 +04:00 Authoring application: h__S__0 (via 86cfb7ae)

MD5: 2bb7a445c168b94c27d239de475474a6 SHA-1: ce6d27882c022a010fdf9d0963af8189d5fad096 SHA-256: ee5313a5f4bb9dd94da625449e8c66556af547fec6c9127037bce5310fe2f496

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristics related to JavaScript execution and obfuscation, including the use of eval() and String.fromCharCode(). The ML classifier strongly indicates maliciousness. The embedded JavaScript streams, particularly javascript_obj0011_000.js, are likely responsible for downloading and executing a second-stage payload, which is a common technique for initial access and further infection. The obfuscation suggests an attempt to evade detection.

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` `9758c7c1b35284e77285af353912a9b3abd4941331f06e557f0ef9fa2e3b8abd`	pdf-javascript-stream	PDF /JS object 11 at offset 0x249E	1146 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `676e70b6ab27b5c74eac23cf920f4cc792c0ab20680b68b36316d44d0c21f21e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x272B	505 bytes
`javascript_obj0015_002.js` `39f95402dfd711840eddff9b483f2f0847312b62bd0f1ae9c761912c13473f2d`	pdf-javascript-stream	PDF /JS object 15 at offset 0x28CC	124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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