Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c2a92acd16df3c…

MALICIOUS

PDF

59.3 KB
MD5: 8b83bacc2f355119e310a71d7e1c07ec SHA-1: b7254a72d5fbcde45aec28aa24aaa733f6130ddf SHA-256: 71c2a92acd16df3cdf3a70a1ffe09999a66d0d6d6cf2e5ebeeacfd6074795dfd
316 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript and a Flash RichMedia object that exploits CVE-2010-1297. The JavaScript appears to be obfuscated and is designed to launch the embedded SWF file, which likely contains shellcode to download and execute a second-stage payload. The embedded URLs suggest a potential C2 communication channel or payload hosting. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • Adobe Flash authplay SWF exploit in PDF — CVE-2010-1297 critical CVE likely CVE_2010_1297_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation, a crafted SWF with ActionScript prototype/AVM-era markers or the AES-PHP/authplay variant markers, and PDF-side shellcode heap-spray staging. This is the static delivery shape associated with CVE-2010-1297 in Adobe Reader's bundled authplay.dll.
  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER
    PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
  • 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
  • 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://code.flashdynamix.com/AES/aes-decrypt.php
    • http://code.flashdynamix.com/AES/aes-encrypt.php
    • http://adobe.com/AS3/2006/builtin

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
WpuVlEGnF.swf
bf9dea6ff47dfb47c2f51b1fa9a09527dfe5e95399ccb2d043ba956b197360c9		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x1E0D 52647 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely
javascript_obj0006_000.js
adddc6330c1fade3051c55a3e6d184f626d547a717e6ef8569bd3481d61d86ae		 pdf-javascript-stream PDF /JS object 6 at offset 0x137 6478 bytes
javascript_obj0006_001.js
bed61f2c77ddd7890de0d034faab2ba574ceb45e9b0430e40964421e24807773		 pdf-javascript-stream PDF /JS object 6 at offset 0x15A 60401 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely

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