PDF malware analysis — malicious · b204ed3ebdf30593

MALICIOUS

PDF

17.2 KB Created: 2010-03-09 23:18:35 Authoring application: q4xQIMaV (via eK7rJ6HZn6yYpJ)

MD5: 842cc733d7c48d71d3d288e823ef046a SHA-1: 52a77775546682157056477e313189acdb573db5 SHA-256: b204ed3ebdf305930c615127c85784b3cafd264ad30a76b95f4100884ba8aa11

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript is being executed dynamically, and the presence of String.fromCharCode further points to obfuscation. The extracted artifact 'javascript_obj0007_000.js' is likely the source of this obfuscated JavaScript, which is designed to download and execute a second-stage payload. The confidence is moderate due to the lack of specific IOCs beyond the script filename and the obfuscated nature of the script.

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_obj0007_000.js` `2a07a59c9e1469a310c30b3a018749aa2ad9cdbdc45f515f01fbbbb1a692740a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	16399 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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