PDF malware analysis — malicious · d3c31e8b24363554

MALICIOUS

PDF

9.8 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 64f3f356701d634cd22f13b75f3c9b69 SHA-1: c025b41a70bcef9c43394b0271c041dbbe19405c SHA-256: d3c31e8b24363554ad960b318e18965b30bfb16db907275e35032868ff9530c8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV with the signature 'Pdf.Dropper.Agent-7308211-0'. Static analysis revealed embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The JavaScript stream was obfuscated using 'unescape()' and 'String.fromCharCode()', suggesting an attempt to hide malicious code. This obfuscated script is likely responsible for downloading and executing a second-stage payload.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7308211-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7308211-0
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_obj0013_001.js` `c0b9a04e5adf18eacf7433dead6d9ac163805970ed054c7fee3436c69eeef09d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	10774 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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