PDF malware analysis — malicious · 44104ed5bb8ff394

MALICIOUS

PDF

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

MD5: 5577bcdeb0c06a7b5b424ef8674d920a SHA-1: 031a67d122c4ee278fbc53fd1eb6ed13102e9c1d SHA-256: 44104ed5bb8ff394864ea50b06587401758274d6022f0fdaeb8e0d9130888ccd

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, embedded as 'javascript_obj0001_000.js', is likely designed to download and execute a secondary payload. The high confidence is due to the direct evidence of obfuscated script execution within the PDF.

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` `84163d7ddbe1149c80dbb2bb955305b12eeae52f191d5b5d265aaf431e956b1d`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	940 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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