Malicious PDF — malware analysis report

Static analysis result for SHA-256 60eb73f4c24efece…

MALICIOUS

PDF

44.7 KB
MD5: 5eb4336fd82eb8464998d98e24fd99ce SHA-1: 53b9e15823eb43b083a4b7432ab30c5d7d8a5347 SHA-256: 60eb73f4c24efeceba0db33638f68a89f106e841407d4739353688f7d04d6e66
336 Risk Score

Malware Insights

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

This PDF file exploits CVE-2010-2883 using embedded JavaScript. The JavaScript code contains a shellcode download URL, indicating it attempts to fetch and execute a secondary payload. The ML classifier strongly suggests malicious intent, and ClamAV detection confirms the presence of exploit shellcode.

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://jeurep.in/nte/kuz.php/yHada0cd51V0100f060006Ra6348fba102Te11a9f28204l0409327
    • 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
416735248c74402b2274585e4d62891dcc2f09ed6b6a25126150bb3607671c36		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0BA 3700 bytes
javascript_obj0012_001.js
604640841845f2c43d4f669a375f4aac4ccc63bd2904bdde5615936ae08c12fa		 pdf-javascript-stream PDF /JS object 12 at offset 0xA100 4586 bytes
generic_stage_recovery_000.js
536fc5315a678f749ce1e27c27cda85ce1a1d33009ca68a8708dec24468eddbf		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA0BA 3650 bytes
generic_stage_recovery_001.js
fa9b0def960e2419e88c56565d81caf0816a1cdf549dc223ff19fc1b494c8f8c		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA100 4536 bytes
generic_stage_recovery_002.js
d64219951f715354855b02e004d0eb140d20bff1c95ba631d50cd9021274bc3e		 deobfuscated-js generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xA0BA 8187 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely
generic_stage_recovery_003.js
80e2e0f13fbf3e837a56dcca5a2687f7c680b5c6ed493c5b4ace50e533997d7c		 deobfuscated-js generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0 45750 bytes
generic_stage_recovery_004.js
fe5ed6fafa9a4bbab607460b8dee2f8f0cc3e4ec57966695f0654cd7d4ece0ba		 deobfuscated-js generic stage recovery percent-decode from decompressed stream at 0x0 at offset 0x0 45798 bytes
generic_stage_recovery_005.js
7bc80ceb517245bbbb0cdf62a6a5958f611bbf27c7119f8f9086495fd5fbafbe		 deobfuscated-js generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x0 at offset 0x0 45748 bytes
font_00_sfnt_off0000033c.bin
683fcffe9abaad29001e134bdd9ad7d1628d5cbbf628c451b6c621f202a7dae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

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