PDF malware analysis — malicious · 9db6cdf136bc56eb

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 24fbac4d5ecb37c260881ce401eecff5 SHA-1: 6fc2b772970c09a89bbe742a343fa4799af3a8ef SHA-256: 9db6cdf136bc56ebc8ae42a19cb82679cc463efc7aa1b542784da68220dc26f8

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, including the use of `eval()` and `String.fromCharCode`, indicating obfuscation. The primary intent appears to be the execution of this JavaScript, which is likely responsible for downloading and executing a secondary payload. The presence of obfuscated JavaScript and the ML classification strongly suggest a malicious document designed for exploitation.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `2b23a9ed7a3713ed5af3fe38763af567dac95b6817bcebfe189f2c1f84e46b07`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	851 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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