PDF malware analysis — malicious · 525ec4a34a52db8f

MALICIOUS

PDF

41.2 KB Created: 2012-09-11 16:55:34 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: c97b94b5fcf7d7cadb1c72df528bcc31 SHA-1: 30eaad68f889a3a875bc8dd04c163c7a61e6111b SHA-256: 525ec4a34a52db8f36f334d6f3dd5fecbb5ad55993bcdf0ccc2947791a78fcc5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. Heuristics indicate obfuscation and suspicious extracted artifacts, specifically a JavaScript file. The JavaScript action and embedded JS stream suggest the file's primary purpose is to execute malicious code, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

Heuristics 3

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9C5E	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_off00001463.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1463	17756 bytes
`font_01_sfnt_off00004275.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4275	17892 bytes
`font_02_sfnt_off000070b5.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x70B5	18720 bytes

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