Malicious PDF — malware analysis report

Static analysis result for SHA-256 359e0532e6745a38…

MALICIOUS

PDF

2.5 KB Created: 2010-08-08 16:01:33 +04:00 Authoring application: PDFill: Free PDF Writer and Tools
MD5: 634fcc5aa7b5a1768542b896e128ff45 SHA-1: 78249f6e765d463eeb29028d99937511b3c55e2d SHA-256: 359e0532e6745a38590fdb8207a89a95e479c0de673efa47ce4e9276b49beb06
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function, which is known to execute arbitrary code. ClamAV also detected the file as Js.Exploit.Shellcode-18, further confirming its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection on an extracted artifact. The presence of external URIs, though benign in this case, is typical for malware delivery.

Heuristics 9

  • 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. (matched in decompressed stream)
  • ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.Shellcode-18
  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.pdfill.com)/S/URI
    • http://www.pdfill.com

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js
734e73907f617fbb5c52964a9c808ba2af906f7d07abffd3201b81829a50780a		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1383 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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