PDF malware analysis — malicious · d4a455bbf8e030e0

MALICIOUS

PDF

54.8 KB Created: 2012-09-22 12:18:21 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: b4b97ccc63019484468c78116893fff4 SHA-1: cd4c426cdee820fa7d5821df68d34b70014476c3 SHA-256: d4a455bbf8e030e03ebdda60205efbafc56a0a966d5075432588a8d2cf2c65a1

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. Heuristics indicate obfuscation within the JavaScript, suggesting it is designed to download and execute a secondary payload. The presence of JavaScript actions and embedded JS streams points to a common delivery technique for malicious content. The extracted artifact 'javascript_obj0038_000.js' is a key indicator.

Machine Learning

Nyx PDF Classifier malicious score 0.9103

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` `be63095b36d2a7a6bb2354eee6ea8f866bd67eb57984a872fcac65a5a9d7a885`	pdf-javascript-stream	PDF /JS object 38 at offset 0xD252	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_off000017f4.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x17F4	17756 bytes
`font_01_sfnt_off00004606.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4606	17892 bytes
`font_02_sfnt_off00007446.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7446	18720 bytes
`font_03_sfnt_off0000a6d3.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA6D3	18756 bytes

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