PDF malware analysis — malicious · dcbc4077d5e49b79

MALICIOUS

PDF

27.4 KB Created: 2012-07-12 16:44:32 +04:00 Authoring application: Sourceforge.net (via mPDF 5.0)

MD5: 544c7b7e2668f23d88768690d0d16a59 SHA-1: e096599e6cf2f03250d85569fa6a28e967a64100 SHA-256: dcbc4077d5e49b796ed4bfd7218c1482cfb17a6564b103b2021def81572c9782

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Phishing: Spearphishing Attachment

The PDF contains embedded JavaScript, which is heavily obfuscated using unescape() calls. This script is likely responsible for downloading and executing a second-stage payload. The high confidence in the malicious verdict is based on the presence of obfuscated JavaScript within a PDF, 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` `b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991`	pdf-javascript-stream	PDF /JS object 22 at offset 0x66A1	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_off0000112c.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x112C	17756 bytes
`font_01_sfnt_off00003f3e.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3F3E	17892 bytes

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