PDF / .PHP malware analysis — malicious · b53c83d835f6512f

MALICIOUS

PDF / .PHP

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 37265d0c4db8caf1b2294d8b6267523c SHA-1: de80ca1832631530da3e106b463fc7034ea6a129 SHA-256: b53c83d835f6512fd1300ef99988b60b77f47abcb4c963c6fe826606ed4a334d

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_UNESCAPE and PDF_FROMCHARCODE heuristics suggest that the JavaScript is obfuscated, making its exact function difficult to determine. However, the presence of obfuscated JavaScript within a PDF is a strong indicator of malicious intent, likely to download and execute a second-stage payload. The extracted artifact 'javascript_obj0016_001.js' is also flagged as suspicious due to script obfuscation.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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. (matched inside decoded stream)
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_obj0016_001.js` `d7e494806801f874dace04ebf3a27270c6fc1cc6f68bdd831415629dea1a4698`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC9A	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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