Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d691122b73d39b8…

MALICIOUS

PDF

411.3 KB
MD5: b9183507150e32cace16c1dd68f2dc67 SHA-1: e661636544ee0457677777bc04b5e239d0a05ee6 SHA-256: 6d691122b73d39b81411a7d39f9ec4b43209bb31644b5dbed4cc5e6791fd2109
286 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and Flash content, with critical heuristics indicating an exploit targeting Adobe Flash Player (CVE-2011-0611). The embedded JavaScript appears to be a downloader or exploit stage, attempting to execute further malicious code. The benign URLs extracted are likely decoys or related to legitimate Adobe XFA functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
5.swf
59d1843c79e347826e19d6e0062a0d05953ae67af013a3b9265ccca4f425aa1f		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x31D6 2925 bytes
javascript_obj0029_000.js
bbc1d3af06a151ecadb438eb05ddac3d422c9041c4e925cea2947eb6def0d938		 pdf-javascript-stream PDF /JS object 29 at offset 0x334EA 19439 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).
javascript_obj0038_001.js
2c0b66ec50073178ddc3de2aaf0627ef83819a8f71c118ff3b075b4bd82749fe		 pdf-javascript-stream PDF /JS object 38 at offset 0x19E8 1242 bytes
javascript_obj0039_002.js
90b2085c0223b206e7a0f65394a710a11770b73a6699dcb5355bea3dd314d83f		 pdf-javascript-stream PDF /JS object 39 at offset 0x1FB9 3854 bytes
javascript_obj0056_003.js
eab5e6c97c078ea01a27ea6b046480c335555b429356238194699f9c32cfb87d		 pdf-javascript-stream PDF /JS object 56 at offset 0x26FC 1155 bytes
stream_004_off000009f6.bin
69e17a0038b9273e6d005ef52313a832cb41b9cf9713d6134d0cf9f2e59298a7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9F6 434 bytes
generic_stage_recovery_000.js
d92a8bc064d30bd603de73820eb1bb39ccdf87ed0df11bda451f2af98dfe5f2c		 deobfuscated-js generic stage recovery marker-QQ-to-%u from combined JavaScript objects at offset 0x334EA 25649 bytes
generic_stage_recovery_001.js
a94d14872893b0de87164f50ca095997449f247215132b9feff35a2a401784e6		 deobfuscated-js generic stage recovery marker-QQ-to-%u from combined JavaScript objects at offset 0x334EA 19262 bytes
generic_stage_recovery_002.js
9633f55d936840d68d7b453012b8d4a8c5338b98f21dae6f5c5d3ca2a21b9486		 deobfuscated-js generic stage recovery split-literal-normalize -> marker-QQ-to-%u from combined JavaScript objects at offset 0x334EA 25643 bytes
generic_stage_recovery_003.js
0bfb600dee43cf6b320e3d5f799ce7f8332db8c836efc62d6798fdb90128f00c		 deobfuscated-js generic stage recovery split-literal-normalize -> marker-QQ-to-%u from combined JavaScript objects at offset 0x334EA 19256 bytes
font_00_sfnt_off00001493.bin
823021e67c69104f3db2966cb1f6abc7103a6715ef1bffc315b5f9c5ea04a787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1493 7965 bytes

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