Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d525dc7b1df3bf…

MALICIOUS

PDF

1.7 KB
MD5: 56eef0bc7cf611fbd902a241b3cd35d9 SHA-1: 0bcb622c3bc4a07d1fa047fd821202f48a54b169 SHA-256: a7d525dc7b1df3bf758dd24e7d1205691638f124e607f95f3405adc8aef4fdf4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File

The PDF file contains embedded JavaScript and an embedded file named 'eicar.com'. The JavaScript is likely intended to trigger the execution of the embedded EICAR test file, a common method for testing malware detection capabilities. The presence of the EICAR signature confirms the malicious nature of the embedded artifact.

Heuristics 6

  • ClamAV: Eicar-Test-Signature critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Eicar-Test-Signature
  • 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.
  • 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
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
eicar.com
275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x43B 68 bytes
Detection
ClamAV: Eicar-Test-Signature
Obfuscation or payload: unlikely
javascript_obj0009_000.js
4772eeda510878f2933ac4f334639c5d576fa6d220166226501786a833051ffd		 pdf-javascript-stream PDF /JS object 9 at offset 0x49C 169 bytes

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