PDF malware analysis — malicious · c511b41da26319fe

MALICIOUS

PDF

28.1 KB Created: 2012-09-15 11:29:02 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: 687a683c634aebec93e77d4a9ef2d32b SHA-1: 77fa207d53b0fa36dad500988b159a909b755e27 SHA-256: c511b41da26319fe78511e3790fe19948c3a69a5ba4660311dc77cb74decb30e

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 was obfuscated using unescape() calls, as flagged by PDF_UNESCAPE. A suspicious extracted artifact, 'javascript_obj0022_000.js', was also identified. The primary function of the embedded script appears to be downloading and executing a second-stage payload, though the exact URL or execution method could not be fully determined due to obfuscation. This points to a common delivery mechanism for malware.

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` `cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890`	pdf-javascript-stream	PDF /JS object 22 at offset 0x68E1	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_off0000136c.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x136C	17756 bytes
`font_01_sfnt_off0000417e.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x417E	17892 bytes

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