PDF malware analysis — malicious · ac8100c76e25022b

MALICIOUS

PDF

30.6 KB Created: 2011-01-14 00:17:30 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: bcc16fb3573eb307f37e9712c0c91c54 SHA-1: 3a76e821a42e8a193caeab0aca2df4645bacf9fb SHA-256: ac8100c76e25022b1ae3ed528cf601477a2dd659278e7dcdf2c207f47dde3c02

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The ML classifier also flagged this PDF as malicious with a high probability. The extracted JavaScript file, 'javascript_obj0024_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery. The obfuscation suggests an attempt to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0024_000.js` `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`	pdf-javascript-stream	PDF /JS object 24 at offset 0x73B5	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`stream_004_off00001e07.bin` `62d9432795187d4a66d2016289256f5bcd7e817272a12ea8e063c65e20c08745`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1E07	17844 bytes
`font_01_sfnt_off00004c52.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4C52	17892 bytes

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