PDF malware analysis — malicious · 81b043322beda712

MALICIOUS

PDF

41.9 KB Created: 2012-05-14 14:34:55 +04:00 Authoring application: Drupal.org (via mPDF 5.0)

MD5: bc2d0e6a64e027317ac92a58a583be51 SHA-1: 40bc9b5f84a7d51abbaa662e87c499050fbe2137 SHA-256: 81b043322beda712d04ec3294ee80a61c0c21634f8e76d238735ac59ee63fde5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests malicious intent. The extracted artifact 'javascript_obj0031_000.js' is likely responsible for executing the malicious payload. The exact function of the script is not fully discernible due to obfuscation, but its presence within a PDF and the high ML score point towards a downloader or exploit execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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` `df7e0affd237ec8d83f2947a5a6b8abd8fdb1a8dcb1a8ff2d1b4022d2913ab67`	pdf-javascript-stream	PDF /JS object 31 at offset 0x9F46	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_off0000174b.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x174B	17756 bytes
`font_01_sfnt_off0000455d.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x455D	17892 bytes
`font_02_sfnt_off0000739d.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x739D	18720 bytes

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