PDF malware analysis — malicious · f538972a6d1e5d1f

MALICIOUS

PDF

29.2 KB Created: 2012-05-14 14:35:25 +04:00 Authoring application: Drupal.org (via mPDF 5.0)

MD5: 6e1cbb1ad2fb100e68af54feb996b32d SHA-1: 39d791e2dc1cc9e91de80adf8f56ee681f03a163 SHA-256: f538972a6d1e5d1f1cebb3a2fc661c915d19f26e02303230a2f17be65977e1e4

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic firing suggests that the JavaScript is obfuscated using unescape() calls, a common technique to hide malicious code. The extracted artifact 'javascript_obj0024_000.js' further supports the presence of JavaScript. The overall pattern suggests the PDF is a lure to execute this script, which likely downloads and executes a secondary payload.

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_obj0024_000.js` `df7e0affd237ec8d83f2947a5a6b8abd8fdb1a8dcb1a8ff2d1b4022d2913ab67`	pdf-javascript-stream	PDF /JS object 24 at offset 0x6C61	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_004_off000016ec.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x16EC	17756 bytes
`font_01_sfnt_off000044fe.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x44FE	17892 bytes

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