Malicious PDF — malware analysis report

Static analysis result for SHA-256 8476a9326e3430ae…

MALICIOUS

PDF

665.0 KB
MD5: b4b96724e7842cb20e38276d15b45ed8 SHA-1: 4f6d9b65504ccb6eae8efc80068e1c79310a9e96 SHA-256: 8476a9326e3430ae1bd5f10fdc1a292f62b4d27cca3aae77f82f542418fb89b5
238 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains multiple indicators of malicious JavaScript execution, including PDF_JAVASCRIPT, PDF_JS, and PDF_XFA heuristics. Critically, it triggers the CVE-2010-2883 exploit for Adobe Reader, which is known to be used for client-side execution. The recovered JavaScript stage is substantial, suggesting it is responsible for downloading and executing a secondary payload, a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 9

  • 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.
  • 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.
  • 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.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.1/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js
4454b6ae7fb31c999b21d0e9930f4881476b17f96b6937b8abec683a6ee88604		 pdf-javascript-stream PDF /JS object 29 at offset 0xA48A5 15301 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
generic_stage_recovery_000.js
7afa6805815feb600f355b44208f1c3208b6893d34645323be475900183cf6f8		 deobfuscated-js generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0xA48A5 17797 bytes
generic_stage_recovery_001.js
e174f5a48490eb0ac24eb3158a0ca63ae320256bcd4a43dc6a1bc2b3de4fa76a		 deobfuscated-js generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0xA48A5 10516 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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