PDF malware analysis — malicious · 5662823be82c6b91

MALICIOUS

PDF

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

MD5: 4e9f670da16667222a6a19adc82eeee3 SHA-1: bead8254333cb60de03ee41285bf281b9d13acf7 SHA-256: 5662823be82c6b911f5136c9172ba125030f14dc05d784fca6ff950dd98f5a2b

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document 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 actions. The use of String.fromCharCode and eval() suggests obfuscation, common in malware delivery. The primary attack pattern involves leveraging PDF's scripting capabilities to achieve code execution.

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` `f5d3304dbdbdb52793d9c2f05d63233e40a085447c4292db5720260897d94f4d`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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