PDF malware analysis — malicious · 9ac7430ec1041952

MALICIOUS

PDF

7.9 KB

MD5: eca44d2b5c7404f6620c5121485b611f SHA-1: c02e829d796de4e17b1843d0c68a76b2f2ff378b SHA-256: 9ac7430ec10419520b641920074f6dd78b3198f3acb1769f38718ea63fc71b29

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the 'eval()' function and 'String.fromCharCode()' for obfuscation. A critical heuristic identified the use of 'Collab.collectEmailInfo' which is associated with CVE-2007-5659, indicating an exploit attempt. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_001.js', are likely responsible for downloading and executing a secondary payload, although the exact URL or payload could not be reconstructed due to obfuscation.

Heuristics 6

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `4bcc397b34299d9055d3eb3972e17a6a93aee2b93ae955d2d2b85c0cc1cc7c04`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `6e60fe63b42219c3889a102a27e60b1c1a5773e96b5f065783f3b99239b1903d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A05	1825 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `872fbae1c49d80a8ea3df248489bd0b84863404004be1bdcd89ba36c3704108b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x356	4880 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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