PDF malware analysis — malicious · f3f6b63b32ae8d93

MALICIOUS

PDF

28.0 KB Created: 2011-08-02 20:38:13 +03:00 Authoring application: docs.codehaus.org (via mPDF 5.0)

MD5: 09b8bfda59d17ebd3548a96018f82ab8 SHA-1: 9ff4d030b0d1a91f56947414b66e9bd0986b01f1 SHA-256: f3f6b63b32ae8d9386c8551b7cb150a47004e021a915bd446cfe9bfbf591d907

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript, named javascript_obj0022_000.js, is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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` `df7e0affd237ec8d83f2947a5a6b8abd8fdb1a8dcb1a8ff2d1b4022d2913ab67`	pdf-javascript-stream	PDF /JS object 22 at offset 0x687A	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_off00001305.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1305	17756 bytes
`font_01_sfnt_off00004117.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4117	17892 bytes

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