PDF / .TXT malware analysis — malicious · 925de34163152338

MALICIOUS

PDF / .TXT

13.2 KB

MD5: 560ca458a162f9986be892d6769d5da6 SHA-1: 5c4d54c71bfb809972b82ec05832daf1e17b029f SHA-256: 925de3416315233889591b90ae8d824820c9d0148bdea061511fa9571e2dc6f5

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' method which is known to be vulnerable (CVE-2007-5659). The JavaScript is obfuscated and appears to be a stager designed to decode and execute further malicious code, likely downloading a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex execution chain.

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)
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `bedd676af9bf2e3ca07f9e3a10d07bc561e9745801f30653ef176c0c1e7620a3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	336 bytes
`legacy_pdfkit_stage_000.js` `40c2fc73f5d3a4bde9aaf07ed4b93b114adb39c80b75a60a365229f9371e0684`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	12407 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `90c88e8c31a60dec3ede7f8b8e90761b913143155cfecaf6b23c67accce871a5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	5102 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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