PDF malware analysis — malicious · 2fbace2547581af9

MALICIOUS

PDF

2.1 KB

MD5: 8bcc30b696a6bf77eb13c85c7b248548 SHA-1: 8e404223699a3bc697151ae5a006e351ba5f4dd1 SHA-256: 2fbace2547581af93fddf90ae4c301221cd8bd43f82511d89ed1606d3b06bf57

106 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() functions. The heuristic firings indicate the presence of JavaScript actions and streams, with a high severity for eval() and unescape() calls, suggesting the script is designed to deobfuscate and execute malicious code. The extracted artifact 'javascript_obj111611_000.js' is also flagged as suspicious due to script obfuscation. The likely intent is to download and execute a second-stage payload, although the specific URL or execution method is not directly discernible from the provided evidence.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x762	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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