PDF malware analysis — malicious · 4b9093c24fe82c4c

MALICIOUS

PDF

12.8 KB

MD5: 946bfb86cd7c8e3ef0041015add66fac SHA-1: 5f4aebf57d3d0a0c9df5fc5ec0ea8007756efad8 SHA-256: 4b9093c24fe82c4c42a1c3dcd1f0d9316b1d43314f30636d5c1294ce0fd65aac

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file exploits CVE-2007-5659 using a JavaScript stager embedded within the document's metadata and annotations. This stager is designed to decode and execute further JavaScript, likely to download and run a secondary payload. The presence of deobfuscated JavaScript files suggests a multi-stage infection process.

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` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `7d10e63d48e67bb4d923b8f1a84ac20fdf9c2e225e8d8fd42fa2ab72bb75a98c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12438 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `03b65efeee0484735ad2111e65568b286a8eee842916f89c9eae8c681ea403cd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5188 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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