PDF malware analysis — malicious · caa85aa301101eb3

MALICIOUS

PDF

40.5 KB Created: 2011-05-26 16:36:11 +03:00 Authoring application: bing.wiki.usfca.edu (via mPDF 5.0)

MD5: cfe89604bf7f04eca7d13db4f59b5e03 SHA-1: 80f17c2b6f2566c64c75caceab88aa1c05c68fd1 SHA-256: caa85aa301101eb3ecf79e57e63b8cf118427fbcd881c4407c1525ec974e05bd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and JS streams. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript file, 'javascript_obj0029_000.js', likely contains obfuscated code designed to download and execute a secondary payload, a common technique for initial access.

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` `10e15f9e8e631690248396d575e9652903435250e89141f7cc58e4b3e9b10d1b`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9A12	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_off00001217.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1217	17756 bytes
`font_01_sfnt_off00004029.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4029	17892 bytes
`font_02_sfnt_off00006e69.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6E69	18720 bytes

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