MALICIOUS
370
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
This PDF file contains embedded JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to download a second-stage payload. The deobfuscated JavaScript explicitly contains the URL http://62.16.112.143/e/load.php?pdf=ea5d2f1c4608232e07d3aa3d998e5135, which is used to fetch the malicious content. The high confidence is due to multiple critical heuristic firings and ClamAV detections.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 10
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Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF 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)
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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ClamAV: Pdf.Exploit.Agent-34662 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-34662
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV 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.
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unescape() call high PDF_UNESCAPEunescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URLDecoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
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Embedded URL info EMBEDDED_URLOne 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://62.16.112.143/e/load.php?pdf=ea5d2f1c4608232e07d3aa3d998e5135
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0013_001.jsae9bba2cc10a98d0549c857f5189167856257dd89f329268deff2b4ec7b64c0b |
pdf-javascript-stream | PDF /JS object 13 at offset 0x36E | 3295 bytes |
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Detection
ClamAV:
Pdf.Exploit.Agent-34662
Obfuscation or payload:
likely
Carved artifact contains 3 eval/decoder/string-building token(s).
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combined_document_js_000.jsbddce553258f252a7d2a183ed12a2cd0e7c7aca0f5eec52f9bf2dcf0ca2a1ca8 |
deobfuscated-js | combined document JavaScript streams at offset 0xF | 3319 bytes |
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Detection
ClamAV:
Pdf.Exploit.Agent-34662
Obfuscation or payload:
likely
Carved artifact contains 3 eval/decoder/string-building token(s).
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