PDF malware analysis — malicious · 4ec36d0fb79abcaa

MALICIOUS

PDF

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

MD5: 957efa8b5cf33ee3049f0dc6139977df SHA-1: 4d39677e1cf3149dc91d49925172428d87bdb6d5 SHA-256: 4ec36d0fb79abcaaf219e7fbd7004a1465bf029d488899fb7213639b6b2f5558

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple JavaScript-related heuristics, including embedded JS streams and the use of unescape() and String.fromCharCode functions, indicating obfuscated code execution. ClamAV detection as 'Pdf.Dropper.Agent-1828743' strongly suggests a dropper functionality. The embedded JavaScript, although obfuscated, likely aims to download and execute a secondary payload, which is a common dropper behavior.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828743 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828743
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` `329343d27c6a6216dc0fc0a858385345e649f7ea9efd32d07a188b31eb885e9c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11961 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.