PDF malware analysis — malicious · eed7a83860166979

MALICIOUS

PDF

1.95 MB

MD5: 6529db158f905eab25a0e79c25680c27 SHA-1: 3caaffc29de8af8ea2805ec9ce5f5afab402cab5 SHA-256: eed7a83860166979c2b12336ba01aaafb0d12fbd0fcccd2e4b43c10ff36913a0

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The JavaScript utilizes eval() and unescape() functions, along with String.fromCharCode, to deobfuscate and execute its payload. The reconstructed strings 'wuzSnaDI87bIytDK0cL8u7Pm3ZDb5P7/8vHzhObY1r/mrKHb85P7le6ro96poA==' and 'pPH0laefmqSyt6eSt9+J5eK0tIKmmoezpPGpwqGamqS2vPLHt9+K57HgtIKmmoezpPGplaLJmqSw56bHt9+Hs+DgtIKikovhpPHyxKfPmqS1tKmVt9+Hs7e0tIKgnomy' and 'pPGplaCemqSy56XCt9+IsrnmtIKlko/kpPH3k6KZmqS14qmVt9+Hs7C8tIKgmoq3pPH1k6KZmqSyt/TEt9+Hs7W9tIKqyIzlpPH3wqKZmqTitKLEt9/Zsri9tIKqnt6ypPGmw/GamqTitaHAt9+PteLltIL2mo/i' are likely obfuscated URLs or malicious code. The primary intent appears to be the execution of this deobfuscated JavaScript, which likely downloads and executes a second-stage payload.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.

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