PDF / .TXT malware analysis — malicious · 98eb6fd03e669061

MALICIOUS

PDF / .TXT

21.8 KB

MD5: 72895bbef9acad99aec0ffad00f7b69c SHA-1: 74645d7d69b1760abd1b3b04c5c235945554055b SHA-256: 98eb6fd03e6690611ab2f7f6af5843a0a193be0697e159632c25ca6073bbf94e

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The sample is a PDF file that leverages embedded JavaScript to exploit CVE-2007-5659. The critical heuristic firing indicates the use of `Collab.collectEmailInfo` with obfuscated JavaScript, a known technique for exploiting this vulnerability. The embedded JavaScript streams, particularly `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_002.js`, likely contain code to download and execute a secondary payload. The `eval()` and `unescape()` functions are heavily used, suggesting obfuscation to hide the malicious intent. No specific malware family is identifiable from the provided evidence.

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `2bb3bdba2863fd313ac793a03011597c562d64ae158fe9cdb98e221d243056d9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3244 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` `eee1c2cf7bf12ff1d4e82892c676412bf948283e38b173d645ab6447be87cc5f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE70	17124 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` `97e4795a0a0b22869cae5baee77c2e3c3da57333d1a479731788f8bb8447d485`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x518A	1412 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `707b4f873c7f60778c3e6377adab6a5d84333241a7654fdf9505f025cd4620a2`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE70	1470 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` `45f33a2b6011dbedaffbca7d7ed47c6f494a02676d7ebb603cee90d70a37c9b2`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x518A	79 bytes
`legacy_pdfkit_stage_002.js` `a5f0ac2d84728c29472e0fd528ad39d5c4728bddeb0f8a8d42279a8b3c9f2369`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE70	1550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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