PDF malware analysis — malicious · 6ea8de5007122583

MALICIOUS

PDF

22.7 KB

MD5: 6897580b968e0976dfffe3a967b0b1f8 SHA-1: bba4e5fef121dae9174bf0b20153eac0df880ea5 SHA-256: 6ea8de500712258352b1abc125d306edcc7e7c25d910061fffdcfcc05b29b38d

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains obfuscated JavaScript that leverages the Collab.collectEmailInfo method (CVE-2007-5659) to trigger an exploit. This JavaScript is designed to download and execute a secondary payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_email. The presence of JavaScript exploit clusters and shellcode download URLs strongly indicates a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (identified after JavaScript deobfuscation)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF 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.
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded 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).
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.
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://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_email

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `d4c2cc405616f53864fcdd298fc5ca27da730686745be3d7b67210805e9fb4d5`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3568 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `21a2f621ddd6c4135cb71f78a305717ac952fc5fbe3d32493eeec0d3db92b44c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFB4	17702 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `105dd6bed183a27b5e62ba264c6823760741a031c77a4e0492c008df510081f9`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5510	1395 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111711_003.js` `35e335dab0133d7466dbaf3ecadfb607c476fb163e3acfb3e1f615f9f66b17b9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	22820 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).
`javascript_obj111712_004.js` `43897cd67ec9b11e40beefea923946dc769a7521a4683b57385f585a8c96c756`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFD8	19198 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `900684b66786d65d0c5bebdfab6ef324c0b34ffcfef8fdd0d7d4e9401a0a8ca5`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5532	1444 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `dd8eba4193ecda09969e5585352df360631acb7126f0abf538431dbef84e4015`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xFB4	1474 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `893b6a69a6b1f96ef94da875e2c6de5a6ab10d72b7676187c78f81073910b29c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5510	80 bytes
`legacy_pdfkit_stage_002.js` `577a73fccd41e4e94e026434af95701ca5e03b499c02ce74d0c56d8493e70687`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1555 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `9846ae3a9fde73fbbca8c3c524030f17beb824b1db5f4a59b05ed922e3fde83d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xFB4	7860 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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