PDF malware analysis — malicious · 559e22aa45c45a3b

MALICIOUS

PDF

8.1 KB

MD5: 87f2b9820925d6ded86b4a5d2c36893b SHA-1: e218dd7e3278e602c359aecc99a6933ff39d6625 SHA-256: 559e22aa45c45a3b0da56a2f57c89fba7a1845d1affa9189989840c6f05d70cd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.002 Malicious File Execution: Malicious JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() and String.fromCharCode() functions are used within the JavaScript, suggesting dynamic code execution. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the suspicious extracted JavaScript artifacts and the high unknown exploit score. No specific family could be identified due to the 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `4735e23e6138599e93e8626c3d6e9cf53afa368626b1f6efb374ed1ac252cf21`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `929f530db04579c059a9ad694942ebba650b28c2e9b75514e822a169f18d78b9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AEE	1851 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.