PDF malware analysis — malicious · c9748591d4d28080

MALICIOUS

PDF

52.8 KB Created: 2011-11-21 10:02:07 +02:00 Authoring application: Hawaii.edu Pharmacy (via mPDF 5.0)

MD5: ed2bc7ef3bf08c381c288ea721e4efc2 SHA-1: a7c686608e50f8eae3fc110fbdb68186c622b67e SHA-256: c9748591d4d28080ba8d52b8a45ddb7774a29eedc5de3b2764b1c70ce888f5cc

68 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 document's primary purpose is to execute malicious code, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9880

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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js` `52fda692b07c9aa4efbf58a71a700ecc18f276e70eb54dbe1306b0814a6b382b`	pdf-javascript-stream	PDF /JS object 36 at offset 0xC9EC	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_off00000f8e.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF8E	17756 bytes
`font_01_sfnt_off00003da0.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3DA0	17892 bytes
`font_02_sfnt_off00006be0.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BE0	18720 bytes
`font_03_sfnt_off00009e6d.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9E6D	18756 bytes

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