Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c52d27f18d37969…

MALICIOUS

PDF

61.7 KB
MD5: 3091faa31eb9c998057796bac126a7d2 SHA-1: 2f3a4403cf235f7f07f53307b325cb6edc946abf SHA-256: 6c52d27f18d3796942be26c46e6beba133090971404fb120552a4e4182765fd6
286 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript and a Flash RichMedia object, which are indicators of exploitation. Specifically, the CVE-2011-0611 exploit for Adobe Flash Player was detected. The embedded JavaScript appears to be involved in downloading and executing a secondary stage payload, as suggested by the 'generic stage recovery' heuristics. The benign URLs extracted are likely decoys or related to legitimate PDF functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 11

  • Adobe Flash Player RichMedia exploit critical CVE likely CVE_2011_0611_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation with an embedded AS3 SWF loader (ByteArray/loadBytes) and shellcode heap-spray staging. This is the static exploit shape associated with CVE-2011-0611 Flash content delivered through Adobe Reader.
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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 13

Files carved from inside the sample during analysis.

FilenameKindSourceSize
5.swf
797559d3f1e4f62f7d7ec5a729b60c863e13118d22afb32eab08faf38dc7c87f		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x40C5 2809 bytes
javascript_obj0029_000.js
2935a8414dee57f28ea12818711137fae8e1b2280d76dd06ce09e4d8c7471711		 pdf-javascript-stream PDF /JS object 29 at offset 0xD2FB 19788 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).
javascript_obj0039_001.js
79a847f48c29830c80cf0408c7505d8bd07472b58ec4ea49698a533638d7bb04		 pdf-javascript-stream PDF /JS object 39 at offset 0x1E9B 5637 bytes
javascript_obj0056_002.js
2b0cb364300292a88607c7b04076629077f1b58bbf9fa93686a58f4ad62ef40b		 pdf-javascript-stream PDF /JS object 56 at offset 0x32FA 1417 bytes
stream_004_off0000088f.bin
69e17a0038b9273e6d005ef52313a832cb41b9cf9713d6134d0cf9f2e59298a7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x88F 434 bytes
generic_stage_recovery_000.js
b3727a71f0f958c92005c9a0af13d4db070abba43e16a05435ce7be02540b798		 deobfuscated-js generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0xD2FB 26665 bytes
generic_stage_recovery_001.js
422824bc8b6272b7af446c8979f1fdf4ab756879b408d6f43908a90d57643d26		 deobfuscated-js generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0xD2FB 20186 bytes
generic_stage_recovery_002.js
1826af68036889caa8a98f30c4d77a8be936e2cf437789197ba5ceefa0af47eb		 deobfuscated-js generic stage recovery split-literal-normalize -> marker-MM-to-%u from combined JavaScript objects at offset 0xD2FB 26566 bytes
generic_stage_recovery_003.js
05181545b1a48151f137c6a4d4e0791754061be46e635204c1562022822d1d36		 deobfuscated-js generic stage recovery split-literal-normalize -> marker-MM-to-%u from combined JavaScript objects at offset 0xD2FB 20132 bytes
generic_stage_recovery_004.js
2e965cd8e3e8dcb46aaafad6d5bdf3e992e5d5e87be59c4721c717eb74521787		 deobfuscated-js generic stage recovery marker-MM-to-%u -> split-literal-normalize from combined JavaScript objects at offset 0xD2FB 26566 bytes
generic_stage_recovery_005.js
0aab6c1954b548dc068084c627a1b62a58a104a643c4c185174d8e45c93ca046		 deobfuscated-js generic stage recovery marker-MM-to-%u -> split-literal-normalize from combined JavaScript objects at offset 0xD2FB 20132 bytes
font_00_sfnt_off00000e51.bin
9520d1e3c26c38a7d8e0587578a21196782149e3c5f4b565229deafde3ff3a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51 8429 bytes
font_01_sfnt_off00001663.bin
18f2d21f655a09be0df9f6bfb4b539e43160f5a64a3e1b2dd7a4c8a5a185a5d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1663 8429 bytes

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