PDF malware analysis — malicious · 4057066011e09bb3

MALICIOUS

PDF

39.9 KB Created: 2011-11-21 10:01:58 +02:00 Authoring application: Hawaii.edu Pharmacy (via mPDF 5.0)

MD5: ca8fc1bd8b028c8c592051253e25cd38 SHA-1: 36be5fe992bfa85e313b7bc1405be64d40d5ebbc SHA-256: 4057066011e09bb3b412f1ef2d700d0e612dc25a2da26f3b4694939710cd5efd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious. The ML classifier strongly indicates malicious intent. The extracted JavaScript file, 'javascript_obj0029_000.js', exhibits obfuscation, suggesting it is designed to download and execute a further payload. The exact nature of the payload cannot be determined due to obfuscation, but the presence of JavaScript actions and streams points to a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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` `52fda692b07c9aa4efbf58a71a700ecc18f276e70eb54dbe1306b0814a6b382b`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9791	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_off00000f96.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF96	17756 bytes
`font_01_sfnt_off00003da8.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3DA8	17892 bytes
`font_02_sfnt_off00006be8.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BE8	18720 bytes

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