PDF malware analysis — malicious · e842d3e3f997389b

MALICIOUS

PDF

989 B

MD5: 8e9fd5e1a9f9fdba1d8b2b3f12c48759 SHA-1: edce24221e4dab9586617c1a753a00063e4a85d2 SHA-256: e842d3e3f997389bd86b2e4b040600571f6a4d9bc4976e7cda1b059bb13cbc1d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode. This suggests the script is designed to download and execute a second-stage payload. The obfuscation and use of eval() are common techniques for evading static analysis. No specific family could be identified due to the heavy obfuscation.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111712_000.js` `76c53926cbc4c35d3010fe446347fa14fd90c9482896fe9edb5e1e5172fcc85b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1E5	531 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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