Malicious PDF — malware analysis report

Static analysis result for SHA-256 d693bf16efb7d9ec…

MALICIOUS

PDF

12.3 KB
MD5: 7f43cd2b1ef925171e14458ddda39565 SHA-1: 13075a4e1575965ffce97863574ecde175b91e21 SHA-256: d693bf16efb7d9ecf0dec1b2eeed6406a4a58b1fa7b21d00512fffd059c323bb
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This JavaScript is designed to download and execute further stages, as indicated by the presence of deobfuscated JavaScript files named 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The ClamAV detection 'Pdf.Dropper.Agent-9448897-0' further confirms its malicious nature as a dropper.

Heuristics 5

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • ClamAV: Pdf.Dropper.Agent-9448897-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9448897-0
  • 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.
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35		 pdf-javascript-stream PDF /JS object 7 at offset 0x19D 343 bytes
legacy_pdfkit_stage_000.js
cc60ab5b231c2af7444017aa277b3f0922704ba14dbcac02046ade7d14bab506		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x2F0 12337 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
legacy_pdfkit_stage_001.js
e2af9195e61a7d5a1695253dfc1bbb393f71a6f40313a53224b653914a0d7a8a		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x2F0 5079 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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