PDF malware analysis — malicious · d94aa1bed6a36170

MALICIOUS

PDF

28.3 KB Created: 2012-09-16 23:25:24 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: aed08e5b329e7b61d13f16b6cd113f2a SHA-1: d3e8e8092b1ffae5fcdec6cfac31f0469c930dcf SHA-256: d94aa1bed6a361701430afb4054c88dbd32a32c4a6aeebc3d479999e7ffa32ca

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained obfuscated JavaScript. The JavaScript stream, identified as 'javascript_obj0022_000.js', exhibits characteristics of obfuscation, including the use of unescape() calls. This suggests the script is designed to download and execute a secondary payload, a common technique for initial access or further system compromise. The presence of JavaScript actions and embedded JS streams within the PDF further supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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` `76d3bb447acd5b45376b0e8b83aa4aa0566d30e3dffb5ca563e124aa7ad84a28`	pdf-javascript-stream	PDF /JS object 22 at offset 0x69AD	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_off00001438.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1438	17756 bytes
`font_01_sfnt_off0000424a.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x424A	17892 bytes

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