PDF malware analysis — malicious · 26a8d107ea155651

MALICIOUS

PDF

9.6 KB

MD5: 8aaac46f792d8f182a48b2557e4ce9d1 SHA-1: 1f8f1118e4d14d0793adca9239a4e3c85d648072 SHA-256: 26a8d107ea1556519da46d4f28d676879b70e6a61ae9518d97bd5fc657a7bea7

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' method, which is a known vulnerability (CVE-2007-5659). The JavaScript is heavily obfuscated but appears to be a stager designed to download and execute a second-stage payload. The presence of 'syncAnnotScan' and 'getAnnots' further indicates the exploitation of PDF reader vulnerabilities. Due to the obfuscation, the exact final payload and delivery mechanism cannot be definitively determined.

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 3

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` `a873774c2fdae1ab765caace920c963d26085545f56aedaca389509d5cb82b60`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5171 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `091ee2f4b0221e52f2d43c924cee6be01ed392414bd43e18fb8f934b4383d3c6`	deobfuscated-js	PDF JavaScript deobfuscation pass	43912 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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