PDF malware analysis — malicious · 1c5d64d6ec831b94

MALICIOUS

PDF

28.6 KB Created: 2012-09-22 12:17:39 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: 29e3123985c8b90b8e6009182ea56cd7 SHA-1: dd6873abc81ffdf7b87c2e34d66155be0a56fc1e SHA-256: 1c5d64d6ec831b9464129c50e6aeb5cee70e13d7dc765e9e5bc9d0014129b8b7

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The PDF_UNESCAPE heuristic and the ML_NYX_PDF_MALICIOUS finding point to obfuscated JavaScript, likely intended to download and execute a secondary payload. The extracted artifact 'javascript_obj0022_000.js' is a key indicator of this malicious activity.

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` `be63095b36d2a7a6bb2354eee6ea8f866bd67eb57984a872fcac65a5a9d7a885`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6AAF	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_off0000153a.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x153A	17756 bytes
`font_01_sfnt_off0000434c.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x434C	17892 bytes

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