PDF malware analysis — malicious · 1fc7f734395ce8cd

MALICIOUS

PDF

28.4 KB Created: 2012-11-25 13:26:34 +04:00 Authoring application: Java.net (via mPDF 5.0)

MD5: 7480ca7a312870b43c3b1a9ce3d9f047 SHA-1: 04e4a3813e39afbedb0617e1cc7a5a14164d6bcd SHA-256: 1fc7f734395ce8cdad903ca52a6df5000f11b9ae78d9f05bf633b7a7c3005ee2

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic specifically flagged 'javascript_obj0022_000.js' as suspicious due to obfuscation. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial access or further infection. The document body was unreadable, so the rationale is based solely on the script and associated heuristics.

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` `76d3bb447acd5b45376b0e8b83aa4aa0566d30e3dffb5ca563e124aa7ad84a28`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6A67	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_off000014f2.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x14F2	17756 bytes
`font_01_sfnt_off00004304.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4304	17892 bytes

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