PDF malware analysis — malicious · 42e837a657652994

MALICIOUS

PDF

4.5 KB Created: 2008-31-20 53:85:00 Authoring application: 5223 (via 5223 4.4)

MD5: c4735b52c9c1852a1761895f3defc50e SHA-1: bc520ec4a866cf669336623c7c3ab0893062c0c6 SHA-256: 42e837a657652994cbe6167bc54ac350801ab085afd2ff0784fbf94e5236e762

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, as evidenced by the PDF_UNESCAPE and PDF_EVAL firings, and the 'Script obfuscation indicators' in the static triage. This obfuscated script is likely responsible for downloading and executing a secondary payload. The presence of a large embedded JavaScript file (javascript_obj0013_001.js) further supports this. The confidence is slightly reduced due to the inability to fully deobfuscate and determine the exact payload or persistence mechanism.

Heuristics 5

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.
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_obj0013_001.js` `b0af6f47f6c432e8721417ac42c8bce1e4c63ca5524def5987afae9cd5112fd0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	70378 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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