PDF malware analysis — malicious · 8682d433bb372ef4

MALICIOUS

PDF

29.5 KB Created: 2011-01-14 00:19:22 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: 9fc922a735c3dc837cfec8859675b88e SHA-1: d7b5c98b4971a50526c8a12b867aafa618dd7d44 SHA-256: 8682d433bb372ef414a0dd7e91553722739d57f250be693b56675fdb5744d404

106 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_UNESCAPE. The ML classifier also flagged this PDF as malicious with a high score. The presence of obfuscated JavaScript suggests an attempt to hide malicious code, likely for downloading and executing a second-stage payload. No specific family could be identified.

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_obj0022_000.js` `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6ED3	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_003_off0000195e.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x195E	17756 bytes
`font_01_sfnt_off00004770.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4770	17892 bytes

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