PDF malware analysis — malicious · 1f99b740fcacaf3f

MALICIOUS

PDF

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

MD5: 48cce95f085925af3dc11841cc8b00f8 SHA-1: b4b237420450359daf212c5a35148cb85d691704 SHA-256: 1f99b740fcacaf3fca2047bf02552eb0206a8bbc7235d554d94c005866daebd7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell: PowerShell

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 obfuscated and uses String.fromCharCode, suggesting an attempt to hide malicious code. The presence of eval() strongly suggests that the script is designed to download and execute a second-stage payload. The confidence is moderate due to the obfuscation and lack of specific IOCs beyond the embedded script name.

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` `fa43388b5960214d4f44538854cabc742f0cde9601127d77d72e9d885d9ccd23`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	930 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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