PDF malware analysis — malicious · 3aa2794b5d4c96dc

MALICIOUS

PDF

28.7 KB Created: 2012-09-22 12:17:37 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: 5da400a580260669fee2bf98f7ec776d SHA-1: 87e7be64d45a6b7f8511e2a60ffc21da976c1fb1 SHA-256: 3aa2794b5d4c96dc515ad4900b70d46d013e37e2aa571f08f0de2c6f1652a802

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, as evidenced by the PDF_UNESCAPE firing and the 'Hex escape obfuscation' flag in the static triage. This obfuscation suggests malicious intent, likely to download and execute a second-stage payload. No document body text was available for analysis, and the script itself was too obfuscated to determine its exact function or any specific URLs it might use.

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 0x6ADB	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_off00001566.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1566	17756 bytes
`font_01_sfnt_off00004378.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4378	17892 bytes

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