PDF malware analysis — malicious · bbfe78958c0b2b90

MALICIOUS

PDF

17.4 KB Created: 2010-03-14 14:19:23 Authoring application: fr6Dgb4tO (via t78BppeNn)

MD5: a6ed555b2ccd9dc01454a08f12cc5c47 SHA-1: 6b377aad2928f7158778c2defb791d02e3d5661d SHA-256: bbfe78958c0b2b90ffe640ff023ba7da44559bb85d09ca448267fdcdfbba4fd3

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named javascript_obj0007_000.js, is heavily obfuscated using String.fromCharCode and eval() calls, suggesting malicious intent. The primary goal appears to be the execution of this obfuscated script, likely to download and execute a second-stage payload.

Heuristics 5

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.
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_obj0007_000.js` `9f2fcef061876fde364a55040f0daf3e79418bf1d29bb19610ed805c4393609f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	16646 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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