PDF malware analysis — malicious · 4591878978b708f9

MALICIOUS

PDF

56.0 KB Created: 2011-01-14 00:19:26 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: c8230e325ba63a8a172f32b11288d6d9 SHA-1: 7df742e5aea5c7afb2373da287b6155c40155e30 SHA-256: 4591878978b708f99f040ae357ebd760855fb4d4088d863d78775dc5e4b51b72

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier also flagged this PDF as malicious with a high score. The extracted JavaScript file, 'javascript_obj0036_000.js', likely contains obfuscated code designed to exploit vulnerabilities or download further payloads. The presence of JavaScript actions within the PDF structure strongly suggests an attempt to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9174

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 0xD830	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_off00001d96.bin` `005f42ed7f25857e0734d229bee0efaeaeadb2c8d44e8842d9db0bab652d6854`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D96	17896 bytes
`font_01_sfnt_off00004be4.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4BE4	17892 bytes
`font_02_sfnt_off00007a24.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A24	18720 bytes
`font_03_sfnt_off0000acb1.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xACB1	18756 bytes

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