PDF malware analysis — malicious · d83150efff2e1f13

MALICIOUS

PDF

28.6 KB Created: 2012-07-04 18:35:14 +04:00 Authoring application: Instructables.com (via mPDF 5.0)

MD5: 566f9e46acb530f9a47d44ab84d146ea SHA-1: e1f6b2074b52d1f6832643dfa8f51f7cf1e50878 SHA-256: d83150efff2e1f1304564c4fb0e303e5f3d6541d574c8064fc12da5fb56b1f15

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests obfuscation, and a suspicious JavaScript file was extracted. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

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` `b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6A9E	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_off00001529.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1529	17756 bytes
`font_01_sfnt_off0000433b.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x433B	17892 bytes

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