PDF malware analysis — malicious · ffd019fa789eac10

MALICIOUS

PDF

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

MD5: 2064887a4c064fde829559d4b7ddda23 SHA-1: 461ed77fd3fbedab9ef58392b9073aeeae2254c4 SHA-256: ffd019fa789eac10564fe96dda064e0f456e53f203118be4dcfe5f22e4c42b20

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `String.fromCharCode` and an `eval()` call, suggesting obfuscation and dynamic code execution. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves leveraging JavaScript within the PDF to execute arbitrary code, likely for downloading and executing a second-stage payload. No specific family could be identified.

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` `98ed3a3979828bd885e8d0a353e3f000721f6502e587c02df6beb1882ce794bc`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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