PDF malware analysis — malicious · f82822d19fa83345

MALICIOUS

PDF

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

MD5: 986c1d43b5ce0ff3add5540c504d09e6 SHA-1: ecbe381a02e2d4e52a1a59075a2023fceb5ce752 SHA-256: f82822d19fa8334558a85bedde9656806b96a59c83e4e3a3554a60db178cfbfd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_LAUNCH. The presence of eval() and String.fromCharCode suggests obfuscated JavaScript code is being executed. ClamAV detection as 'Pdf.Exploit.Agent-35541' strongly suggests a known exploit is present, likely to download and execute 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` `831147bf3794069877feef4a6db6bd15d884b9a048ff801b8ffdb5240a470b14`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	15626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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