Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b5a891cb1dd328…

MALICIOUS

PDF

44.8 KB
MD5: 09a7cf6f964bfb8ca73489465c7bd71a SHA-1: 9627c9f1f71242f6971a7b28444dae3864609b7c SHA-256: 13b5a891cb1dd32825984d1e9b44005f47f98dfe9160bcc9fed57bba45c84b72
336 Risk Score

Malware Insights

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

This PDF file exploits CVE-2010-2883, a known vulnerability in Adobe Reader, leveraging embedded JavaScript to achieve code execution. The JavaScript contains a shellcode download URL, indicating it's designed to fetch and run a secondary payload. The ClamAV detection of 'Js.Exploit.Shellcode-18' further supports this. The primary malicious URL identified is http://googllestatics.com/tre/VENA.php/yH3f27b8a5V0100f080006R5428c19f10aT73e75ae9201l0016Kbc806684327.

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://googllestatics.com/tre/VENA.php/yH3f27b8a5V0100f080006R5428c19f10aT73e75ae9201l0016Kbc806684327
    • 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
041b77d5f850700c6be061e87d265bbce25d39dd1db35e5bdf2481f24e06ed73		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0BA 3730 bytes
javascript_obj0012_001.js
86fc86f5bd9c5473f75d84ad229f6847c269b03fe1bbf69d2d0954e959515546		 pdf-javascript-stream PDF /JS object 12 at offset 0xA100 4616 bytes
generic_stage_recovery_000.js
79bd34e3fc23774fa76a87bcfd15dbd60dce42b211208d38d1a4280fc62df38f		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA0BA 3680 bytes
generic_stage_recovery_001.js
0b152c2ac716af9e43014dbc9dbd7d4c7d3c373e387fdffa8d4b035ea255e835		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0xA100 4566 bytes
generic_stage_recovery_002.js
08f328e43e4b6c44b65b217b66dfa1389132ba32063f6df55ec3f09e7418246b		 deobfuscated-js generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xA0BA 8247 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely
generic_stage_recovery_003.js
50dcec943d699d7f7b5e7daab64d9487ce0def511d99206a2a03724d3d602044		 deobfuscated-js generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0 45780 bytes
generic_stage_recovery_004.js
a50fc2f3f875c1d139088a78d78d6cbe009c5b254f2e3c96ef28cc66cae7c665		 deobfuscated-js generic stage recovery percent-decode from decompressed stream at 0x0 at offset 0x0 45828 bytes
generic_stage_recovery_005.js
dafe664e63122e1cd1ab253312506a75fbcd9f5a33f9c65f1a509995334e506d		 deobfuscated-js generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x0 at offset 0x0 45778 bytes
font_00_sfnt_off0000033c.bin
683fcffe9abaad29001e134bdd9ad7d1628d5cbbf628c451b6c621f202a7dae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

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