Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e2e68210f354a4…

MALICIOUS

PDF

44.7 KB
MD5: da3e0a28a7d9aa39604a33731917429f SHA-1: 6e346a95260a69f97cbd66d99f73e6ec1de68f3b SHA-256: 62e2e68210f354a46277bca581a788afcd6bcd0b70f81a950a9897fd5e3e03e0
336 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2010-2883, a known Adobe Reader vulnerability. The JavaScript is designed to download and execute a shellcode payload from the URL http://halop.in/nte/avorp1koha.asp/yUd1cf61ceHfe9d7adfV0100f090006Rc922feef10aTb2273aa8201l0409327. This indicates a multi-stage attack where the PDF acts as the initial dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 10

  • 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.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://halop.in/nte/avorp1koha.asp/yUd1cf61ceHfe9d7adfV0100f090006Rc922feef10aTb2273aa8201l0409327
    • http://www.bitstream.com
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
a1447ac9caf51e748448cdcb55d1ec2d047ccb7b58e4d2eff70f0658b05c772c		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0BA 3718 bytes
javascript_obj0012_001.js
3e62743281a97969a2606654afead662a869fc880c6764b8377a27e3246f27ff		 pdf-javascript-stream PDF /JS object 12 at offset 0xA100 4604 bytes
generic_stage_recovery_000.js
9c5afc00827436970d51dbdd3e91bd72a8835f03da42d1f2ea59c2fc58c7c33e		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA0BA 3668 bytes
generic_stage_recovery_001.js
d6bb52e496f5b8db192434f36d648be0d0716df7155361eea3edd8a60faf1d42		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA100 4554 bytes
generic_stage_recovery_002.js
2eb881aead5ddd688a08eb90702cc46c0de38c310e7372e8080c8a0bb0fc27fe		 deobfuscated-js generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xA0BA 8223 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely
generic_stage_recovery_003.js
647dd306184b0e84a42c5fba70a71003faf803e2863992612dad267c6fa55fbd		 deobfuscated-js generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0 45768 bytes
generic_stage_recovery_004.js
f33f4e8da87120ba0ec26a94275b82f469fc1402931c7e6be96f3106529c50d6		 deobfuscated-js generic stage recovery percent-decode from decompressed stream at 0x0 at offset 0x0 45816 bytes
generic_stage_recovery_005.js
04cc76b8af86b87e1fe45f082335d9605a98353cd429808aa174ef9b01425b54		 deobfuscated-js generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x0 at offset 0x0 45766 bytes
font_00_sfnt_off0000033c.bin
683fcffe9abaad29001e134bdd9ad7d1628d5cbbf628c451b6c621f202a7dae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

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