Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59af992703ebd6e…

MALICIOUS

PDF

1.42 MB Created: 2009-09-15 13:36:01 +02:00
MD5: 076592fc002519a3bbc3213395bab9ef SHA-1: 5f1fd34152580f0f3a437747e35a62d711b8b08c SHA-256: c59af992703ebd6ea6088cfe8c251f08967ae3e9d9a72ff2f6014c12880a8c05
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

The PDF file contains embedded JavaScript and RichMedia (Flash) content, triggering a critical alert for CVE-2011-2462, an Adobe Reader U3D/RichMedia parser exploit. This indicates the file is designed to exploit a vulnerability upon opening in a vulnerable PDF reader. The presence of JavaScript and embedded files suggests a downloader or dropper functionality, aiming to fetch and execute further malicious content. The embedded URL points to Adobe Reader, likely a lure to trick users into downloading a vulnerable version or to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0357

Heuristics 9

  • Adobe Reader U3D/RichMedia parser exploit critical CVE likely CVE_2011_2462_RICHMEDIA_U3D
    PDF combines U3D stream markers with RichMedia and JavaScript/XFA activation surfaces. This is the U3D RichMedia exploit document shape associated with CVE-2011-2462, even though the U3D marker is not exposed through the canonical /Subtype /U3D dictionary.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_025_off000d45a8.js
3b5b723cd74709605165fa6adef9df2935bf1aa73c0aea7cd4a65e270d8aaf83		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD45A8 1891 bytes
stream_036_off000dcc64.js
7a345e22a85b9270120c5a49ec3aaf3e3f59f542368670bacc30d2ca39fef6fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDCC64 550 bytes
stream_040_off000de6c8.js
dd90ed51f69335eea3c1d53a317338a37990c328740b7e96725272aac51e0431		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE6C8 16286 bytes
stream_041_off000dfbc9.bin
80856aa83ee1b923ecf8b2cbe03ed0d3060d487cf4940578da01f1a53587f977		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDFBC9 68089 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
stream_042_off000f04f0.bin
30994c0db15d4c1029ba6b11d86147959cae739ea56400aed11bbd0c9b3b319e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF04F0 630980 bytes
objstm_0104_00.bin
cc4fa4c29b0ef6c239ba7b9d11a3318581008db1aa972b5bcfa14b819b1cd429		 pdf-objstm-decoded PDF /ObjStm 104 0 obj (inflated) 14328 bytes
objstm_0106_00.bin
25f031dda767c39b54a3be0ad3dd1ad905af5bdef9f34c01a4fff8d7b1172cc1		 pdf-objstm-decoded PDF /ObjStm 106 0 obj (inflated) 8452 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.