PDF malware analysis — malicious · 37fe00f19c450a72

MALICIOUS

PDF

55.9 KB Created: 2011-01-14 00:19:44 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: cf297c455a5859bfe10d5fac1413bd25 SHA-1: b17a35ecb965af6264e928ff56c0442af0a7684f SHA-256: 37fe00f19c450a7250e56032a95b1b977cae2ccb21e08a673ed8169427ca4e94

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious. The ML classifier strongly indicates malicious intent. The extracted JavaScript file, despite some obfuscation, is likely responsible for downloading and executing a secondary payload, which is a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9041

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` `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`	pdf-javascript-stream	PDF /JS object 36 at offset 0xD7FD	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_off00001d5f.bin` `5f84c24630dde479d2a01be4af0b6b7c248d95676304983e21612b1e47a7c40b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D5F	17856 bytes
`font_01_sfnt_off00004bb1.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4BB1	17892 bytes
`font_02_sfnt_off000079f1.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79F1	18720 bytes
`font_03_sfnt_off0000ac7e.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAC7E	18756 bytes

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