PDF / .TXT malware analysis — malicious · 456bf9e0b905af01

MALICIOUS

PDF / .TXT

13.0 KB

MD5: 89633e4e11ec546e23285f5fac402b1f SHA-1: 6d46260d0153fd6b75f3c869baa5f04d4f18c24f SHA-256: 456bf9e0b905af019e470be87344cf382c0e67a1b234dbba60a33a2b13990137

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. Critical heuristics 'PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER' and 'CVE_2007_5659' point to the use of JavaScript within annotation subjects for executing code, a known technique for exploiting older PDF readers. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js', 'legacy_pdfkit_stage_001.js') suggests a multi-stage approach, common for downloading and executing further malicious content.

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` `5cc2a5573c24b487d2d5569589cfb51bfd0218dccbd4c743a0b18e19fcf50236`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	12080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `619a2dfaa3db68686269df14df457b340b0f09b01804dc07b23213f631f2477d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	5025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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