PDF malware analysis — malicious · f3f8f4ca1d2557fb

MALICIOUS

PDF

54.5 KB Created: 2012-10-19 02:58:06 +04:00 Authoring application: http://www.instructables.com (via mPDF 5.0)

MD5: 9fa0599b7a2816dc5029c672fa50aab2 SHA-1: 7d00733684d9a42429c2b9ae7744b1dbb036c0ba SHA-256: f3f8f4ca1d2557fb43956a615023872444d70f8932fde8cecbaf4ea2d9e5927a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, named 'javascript_obj0036_000.js', exhibits obfuscation and hex escape sequences, indicating a malicious intent to conceal its functionality. The primary function of this script appears to be downloading and executing a secondary payload from a remote source, which is a common technique for initial access and further system compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9392

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` `86bd26d4bd59bd5bac918a1e6d170e9557ac2bab8e8f979ca129ff73eefa041a`	pdf-javascript-stream	PDF /JS object 36 at offset 0xD2DC	127 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_off0000187e.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x187E	17756 bytes
`font_01_sfnt_off00004690.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4690	17892 bytes
`font_02_sfnt_off000074d0.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x74D0	18720 bytes
`font_03_sfnt_off0000a75d.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA75D	18756 bytes

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