PDF malware analysis — malicious · d23614f5b19514f8

MALICIOUS

PDF

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

MD5: 52daeb8599df847dd0abf339ad3418ff SHA-1: be2013161fcaf08182bdb27ecd8eb1c1832b3feb SHA-256: d23614f5b19514f8406ba1466d10542712d77fbdad4c77689777f96bed8fc20b

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by the use of String.fromCharCode and eval() calls. This script is likely designed to download and execute a secondary payload. The presence of PDF_JAVASCRIPT and PDF_JS heuristics further supports this. The confidence is slightly reduced due to the obfuscation making precise analysis of the script's final action difficult.

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` `580f9e4af4336cfb75355b1d709799821258912a83374a0881344f3ca37288c7`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	518 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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