PDF malware analysis — malicious · 4821fb92c7b1ae02

MALICIOUS

PDF

11.5 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: b1293ca15eaeda62f6d2cef76675938a SHA-1: b58e4f26d43f7e9028a69def9c4e89b34abc9847 SHA-256: 4821fb92c7b1ae02a3a1965ab833a05425347fe9e2090eed2e7e27cf1d7f09e9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_LAUNCH. The presence of an eval() call and String.fromCharCode suggests obfuscated JavaScript code designed to execute arbitrary commands. ClamAV detection as 'Pdf.Exploit.Agent-35541' further confirms its malicious nature. The primary attack vector appears to be exploiting a PDF vulnerability to run this script, likely for downloading and executing a second-stage payload.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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. (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_obj0027_000.js` `81b481c939dfb2c5839fb8363f3abd2920a682839d0c6703be982d820a78a0c9`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	14787 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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