PDF malware analysis — malicious · f9001c97ea8e2be2

MALICIOUS

PDF

40.9 KB Created: 2012-09-11 15:31:50 +04:00 Authoring application: Gna.org (via mPDF 5.0)

MD5: cb6097cf5874670b114afb1a1a6edb0a SHA-1: c34f1c7dc3afd0c29fe8be00e6a9c47539ad23e8 SHA-256: f9001c97ea8e2be2ed0d8f48ce8ba1e22a64e3b2e6bf87aebcbb311dcf407d64

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, named 'javascript_obj0029_000.js', exhibits obfuscation indicators. This suggests the script's purpose is to download and execute a secondary payload, a common technique for initial access and further infection. The presence of JavaScript actions and streams within the PDF points towards a malicious intent, likely for delivering malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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 0x9B8D	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_off00001392.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1392	17756 bytes
`font_01_sfnt_off000041a4.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x41A4	17892 bytes
`font_02_sfnt_off00006fe4.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FE4	18720 bytes

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