PDF malware analysis — malicious · 89feef7bb2d82319

MALICIOUS

PDF

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

MD5: 8443cff8be8a027c1ded7d146ffb8ff0 SHA-1: 2a09f7765acf1b682b2c8a6b18641156aa13bd3a SHA-256: 89feef7bb2d8231928b48923b2b0a1ed5c77f9928962c2d1ee5311e6718ae329

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 file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named 'javascript_obj0001_000.js', is likely responsible for executing malicious code. The use of String.fromCharCode and eval() suggests obfuscation, making it difficult to determine the exact payload without further dynamic analysis. The primary attack pattern involves leveraging the PDF's scripting capabilities to deliver a secondary payload.

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` `fc207075ebf788d6bea508a62ce36eb2af9c512350eac898c52db787607785ac`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	854 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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