PDF malware analysis — malicious · e9d859887920fb06

MALICIOUS

PDF

44.4 KB Created: 2011-01-14 00:19:29 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: eb92c5378a7e92d7ff975a73734efcf4 SHA-1: f07bc330933fbf1da6ccc8557eaaf0d6f5002713 SHA-256: e9d859887920fb06f3c4f5db8455158ed331d55c51e1c8a9c901e816c0cc23d1

68 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML_NYX_PDF_MALICIOUS heuristic further supports its malicious nature. The extracted artifact 'javascript_obj0031_000.js' likely contains the malicious script responsible for the PDF's behavior, potentially downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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_obj0031_000.js` `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`	pdf-javascript-stream	PDF /JS object 31 at offset 0xAA1F	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_off00002187.bin` `99bd4c8d43a56e6d194c2d4e6ce3ee0c8ebc60912ddb61573dbbdb94a45e6b91`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2187	18016 bytes
`font_01_sfnt_off00005036.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5036	17892 bytes
`font_02_sfnt_off00007e76.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E76	18720 bytes

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