PDF malware analysis — malicious · 935f5dcdbb81959d

MALICIOUS

PDF

4.3 KB

MD5: 9bfd953afdd078b424e8e4dd4a08d7ee SHA-1: 0aca7b4411ca941ee00b8252092a2f0cffa1e412 SHA-256: 935f5dcdbb81959dcc0724823a572a9aacc201b1ee8f042275e9c40499d4c52f

66 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated and uses String.fromCharCode, suggesting an attempt to hide malicious code. The primary function appears to be the execution of this obfuscated script, which is a common technique for delivering second-stage payloads or exploiting vulnerabilities. The extracted artifact 'javascript_obj632148_000.js' is also flagged as suspicious due to script 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_obj632148_000.js` `afaf7c2dfbb5bb22795280f5a0a6e628c96b63b2e0322ec188fb5b43e256ea7a`	pdf-javascript-stream	PDF /JS object 632148 at offset 0x137	8297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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