Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d062038e9dae18a…

MALICIOUS

PDF

16.0 KB Created: 2011-04-18 15:20:20 +08:00 First seen: 2015-09-24
MD5: 6a4798dc1442487becfb9d039c6f6cb0 SHA-1: 939675e2c317ffc347cbd40e13b7a948fe8f0c74 SHA-256: 4d062038e9dae18a5900a0e386ed135a2887d420fcc675a3cd57f226693f9010
112 Risk Score

Malware Insights

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

The PDF file contains embedded RichMedia (Flash) content that is flagged as exploiting CVE-2011-0611. This exploit is known to deliver a secondary payload, indicating a likely attack pattern of initial compromise via a malicious attachment followed by client-side exploitation. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier clean score 0.0247

Heuristics 5

  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0026_00.bin pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 1084 bytes
SHA-256: 0841ed6ca2149b386133777ff3868f6222ba5033d6f52cd654a117610818bd40

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