PDF malware analysis — malicious · 303a1192961c8d83

MALICIOUS

PDF

9.4 KB

MD5: 2597b5006f72d13258bf3b91fcfac145 SHA-1: ac71046fdd34c090cb65e052a38d7be8766ccf3f SHA-256: 303a1192961c8d832fc795caa1aa52ac8905e3ce9b45266d140201104d8e502b

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to Collab.collectEmailInfo. The heuristics indicate a JavaScript stager that decodes and evaluates a hex-encoded payload. This suggests the document is designed to download and execute a second-stage payload, consistent with a dropper.

Heuristics 7

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)
ClamAV: Pdf.Dropper.Agent-7245610-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7245610-0
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `cd5c7cb4a8bc81c4d8935dc932a9fa66783c39b46a5f9133cfcdd3f423dcc955`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `f3e558428fdbeced985bf02893bcd6127534c9b1527c51cce9663ca96dbcf693`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `cf81ade4aefcd794fec5d81fd72c19da9640c4a6942ae56b87ba9554a27f4b26`	deobfuscated-js	PDF JavaScript deobfuscation pass	71935 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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