PDF malware analysis — malicious · c0eb39e8c9a1e369

MALICIOUS

PDF

9.4 KB

MD5: e3e62bfa962ce7b6dbaf130934ccfa95 SHA-1: 926c3d5481d3fe41b04408a248e24bca2c774b85 SHA-256: c0eb39e8c9a1e3697e2f80d75683c5fac99ad66bcd999a9a332c48b7d490db5d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the 'collab.collectEmailInfo' function to exploit CVE-2007-5659. This function is used as a stager to decode and execute further JavaScript, which is highly obfuscated but indicative of a downloader attempting to retrieve and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage attack.

Heuristics 6

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 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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `95b234931479f146b63301cf6cd477f39017aad480d474cc2417e50703b82b89`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5031 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` `d471b88008a52d707adbb6a806f3e67d3fce63cb2020572db06bfab1186dc2ce`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	11868 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` `d124d45d977e3d06373137242497cedd97241f2f6dd2d3a1103ffe18d398f8b5`	deobfuscated-js	PDF JavaScript deobfuscation pass	44397 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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