PDF / .TXT malware analysis — malicious · bd89913fa2dfaccf

MALICIOUS

PDF / .TXT

12.9 KB

MD5: 9590cdcab62ccd66be7c26186e9ff2b0 SHA-1: cbd158578fb0dee4ad64b7dd2a91e1983bcbd479 SHA-256: bd89913fa2dfaccf343ec3cf8fca1d4404efb9a45307da9f14ab8169ea0e10c0

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, triggered by a CVE-2007-5659 exploit targeting the Collab.collectEmailInfo method. The critical heuristics indicate that the PDF launcher concatenates info fields, extracts characters at a fixed stride, and evaluates the result, acting as an eval stager. Two deobfuscated JavaScript files were extracted, suggesting a multi-stage download and execution process. The exact nature of the second-stage payload is not discernible 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)
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` `9a684bddf481ea61790cd648f64f622440f11d3f5e823dab924602629389fce2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	12301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `6db7c7325e09e456c05c9a06d4a01654d362eb80be5a0b9ca888b49d98ff9f4e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	5091 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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