PDF malware analysis — malicious · 1a8ba2d63ae9f3fd

MALICIOUS

PDF

55.4 KB Created: 2011-01-14 00:19:41 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: aa10928dc57433f641dbdceb5159451c SHA-1: 8cce1580de5f1f21ff4a2f5e6be92d040186fe34 SHA-256: 1a8ba2d63ae9f3fd836e0c73532c212c4eadcd0b5ef9e919e69e615d0403de9a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests malicious intent. The extracted JavaScript file, 'javascript_obj0036_000.js', likely contains obfuscated code designed to exploit a vulnerability or download a secondary payload. The presence of JavaScript actions and embedded JS streams points to an attempt to execute code.

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 0xD5E4	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_off00001ab9.bin` `39f3090379c67df57705b6920fbffa3fce8b917480d21531e784dfc8fd0ae8d0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1AB9	18040 bytes
`font_01_sfnt_off00004998.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4998	17892 bytes
`font_02_sfnt_off000077d8.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x77D8	18720 bytes
`font_03_sfnt_off0000aa65.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAA65	18756 bytes

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