PDF malware analysis — malicious · a4dbe54e472b50a4

MALICIOUS

PDF

56.6 KB Created: 2011-01-14 00:17:35 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: d4ca4c9d13b4216c8768041f3f5b8ece SHA-1: 28f0fb728985db911d5b5d47efe63e6f1c00836c SHA-256: a4dbe54e472b50a45f7d9c23a81bf139eaff8fa7d92b208c2efed134e6204e37

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. Heuristics indicate obfuscation within the JavaScript stream, suggesting it is designed to download and execute further malicious content. The document body is unreadable due to encoding issues, but the presence of obfuscated JavaScript is a strong indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9008

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_obj0038_000.js` `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`	pdf-javascript-stream	PDF /JS object 38 at offset 0xDA9E	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_004_off0000200f.bin` `eaf3d031124700fbe525cbaa3db4ce655e573e5a231e060b9ff3479e275d1269`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x200F	17852 bytes
`font_01_sfnt_off00004e52.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E52	17892 bytes
`font_02_sfnt_off00007c92.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C92	18720 bytes
`font_03_sfnt_off0000af1f.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF1F	18756 bytes

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