Malicious PDF — malware analysis report

Static analysis result for SHA-256 199bdf55c2bc6a05…

MALICIOUS

PDF

44.8 KB
MD5: ae6e6fc8d2bf2e1fa1f1f1dacf38141e SHA-1: 3dac5e888152de6db2a56087e9ef196dd44d06a8 SHA-256: 199bdf55c2bc6a0516e82ec5c97f7e511157430cad151e661ec7ee48bd7ccc47
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 vulnerability in Adobe Reader. The script is designed to download and execute a second-stage payload from the URL http://statcounts.com/tre/VENA.php/yH91040386V03f01136002Rdd65f02c10aTddc1280bQ00000000900801F00000000J00000000l0409K7f6f4b68327. This indicates a clear intent to compromise the user's system by leveraging an exploit and downloading further malicious content.

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://statcounts.com/tre/VENA.php/yH91040386V03f01136002Rdd65f02c10aTddc1280bQ00000000900801F00000000J00000000l0409K7f6f4b68327
    • 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
cda6a310a6e75f7aa2434cc1ef45562039be48d50ebd8d548c3a8f00b5f2de63		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0BA 3808 bytes
javascript_obj0012_001.js
bc87341781c6671958660c55340237522ca8179feb8b5bd851579285aa36a261		 pdf-javascript-stream PDF /JS object 12 at offset 0xA100 4694 bytes
generic_stage_recovery_000.js
8d6fee16cf1c4cd6cda761693772b5d083e5923a48899e4cb499e0eb69f559b1		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA0BA 3758 bytes
generic_stage_recovery_001.js
b136fb197e74542d37924aa959ca433cfbbdc81f34fb1e349efb5999a18da49a		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA100 4644 bytes
generic_stage_recovery_002.js
c56287898f3fc8f78c549d86b243fc25577b26a0d7f5e7d624baea0afa086500		 deobfuscated-js generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xA0BA 8403 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely
generic_stage_recovery_003.js
fc192c21fad3de59f567713c188a9f3161baaff0927dd55c748e66b25e2594d5		 deobfuscated-js generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0 45858 bytes
generic_stage_recovery_004.js
452679f0c0f043dcc6e3dc1cb4434259e7bbe10767425f1056548ea615d6ec54		 deobfuscated-js generic stage recovery percent-decode from decompressed stream at 0x0 at offset 0x0 45906 bytes
generic_stage_recovery_005.js
4011185cad7ab82c944269c4dd46e772f18afeab7b1fb065450fad26d3b2d619		 deobfuscated-js generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x0 at offset 0x0 45856 bytes
font_00_sfnt_off0000033c.bin
683fcffe9abaad29001e134bdd9ad7d1628d5cbbf628c451b6c621f202a7dae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.