Malicious PDF — malware analysis report

Static analysis result for SHA-256 de26b8e2a4dbe6bf…

MALICIOUS

PDF

283.5 KB
MD5: a87fae498320a16d2534b963ac3e24bb SHA-1: 2c13aca2ffec631be78c916e9fc898ef172c5d90 SHA-256: de26b8e2a4dbe6bf8256e9ef22013ae6f2394a087ea2d42080871b67dcd3932f
106 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2010-2883 exploit targeting Adobe Reader's CoolType SING font. This exploit likely facilitates the execution of the embedded JavaScript, which is designed to download and execute a secondary payload. The presence of XFA forms and ASCIIHexDecode filters further supports the exploit delivery mechanism.

Heuristics 6

  • Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883
    PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Suspicious extracted artifact info 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.

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js
e36e4d07735702ac46b594b0a8d939578027c617cc6583a54324323f87350c41		 pdf-javascript-stream PDF /JS object 29 at offset 0x45271 14785 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
javascript_obj0038_001.js
2c0b66ec50073178ddc3de2aaf0627ef83819a8f71c118ff3b075b4bd82749fe		 pdf-javascript-stream PDF /JS object 38 at offset 0x1B82 1242 bytes
javascript_obj0039_002.js
d8bbcc5984e6bec8996e18881fad0486ff520c9b9f03ee0fb9694ddfc412340d		 pdf-javascript-stream PDF /JS object 39 at offset 0x214F 1572 bytes
stream_004_off00000b11.bin
69e17a0038b9273e6d005ef52313a832cb41b9cf9713d6134d0cf9f2e59298a7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB11 434 bytes
font_00_sfnt_off00001152.bin
fc85f44193ccd402987935418c4f5fdf6802c96450b789e7fce04f9791933021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1152 7965 bytes
font_01_sfnt_off00001903.bin
1e827515a464087cdace63e3578c118b45a657ed40cdbb9de7eead35c9b593ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1903 7965 bytes

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