PDF malware analysis — malicious · 4617ab5de570bea9

MALICIOUS

PDF

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

MD5: 6c0b110b6ebfbbc6bda489d8d2064ee9 SHA-1: 24370872e30f9ecf451a0409ac6c2e8343031146 SHA-256: 4617ab5de570bea9f22df390244e2301dd8c9e4c3de0a046a0bae90d23b31d9d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. Heuristics confirm JavaScript actions and embedded JS streams, with a critical ClamAV detection for 'Pdf.Exploit.Agent-35541'. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_LAUNCH' heuristic. The presence of 'javascript_obj0027_000.js' further supports the analysis of script-based malicious activity.

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` `615235dfe82cde4bd2e6bc77dae6472e0f4143fbb38efe4fa0c872bb4dc2c416`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	14796 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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