PDF malware analysis — malicious · 56ac1dc03e93df06

MALICIOUS

PDF

27.7 KB Created: 2012-07-11 23:15:25 +04:00 Authoring application: Sourceforge.net (via mPDF 5.0)

MD5: c9cbe848fb5dbe25febed885134f8318 SHA-1: 7459b0c6b8e0ab056e2b925526865c8fccb0eb1d SHA-256: 56ac1dc03e93df06d15a0f047aaa263e5689f22d7a4efcefdb9a3bbd8d446506

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'ML_NYX_PDF_MALICIOUS' classifier strongly indicates malicious intent. The JavaScript stream, identified as 'javascript_obj0022_000.js', was further obfuscated using 'unescape()', a common technique for hiding malicious code. The ML classifier also noted 'Hex escape obfuscation' and 'Script obfuscation indicators'. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the combination of obfuscation and the ML classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0022_000.js` `cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6778	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_off00001203.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1203	17756 bytes
`font_01_sfnt_off00004015.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4015	17892 bytes

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