PDF malware analysis — malicious · 7d5f87f935b9ca2e

MALICIOUS

PDF

41.6 KB Created: 2012-09-16 23:25:26 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: 1514b32cbe52e8887f0dcbdd22858cb1 SHA-1: 4e94108d207804d3e6962178881ccfa09efa5e9d SHA-256: 7d5f87f935b9ca2e9c07d7f2b17c43d8c7d3666cfdaa51144eb9c198915e674c

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 within the JavaScript, suggesting it is designed to download and execute a secondary payload. The presence of JavaScript actions and embedded JS streams points to malicious scripting. No specific family could be identified due to the obfuscation.

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` `76d3bb447acd5b45376b0e8b83aa4aa0566d30e3dffb5ca563e124aa7ad84a28`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9D9B	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_off000015a0.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x15A0	17756 bytes
`font_01_sfnt_off000043b2.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x43B2	17892 bytes
`font_02_sfnt_off000071f2.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71F2	18720 bytes

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