PDF malware analysis — malicious · 26021cf87978909a

MALICIOUS

PDF

9.1 KB

MD5: 4223b619a8c361347ddbe772407d0313 SHA-1: e9a00fa6cdb2a38b739cbcbea864c9427d029cf8 SHA-256: 26021cf87978909a2824e8a53cfc50436de4333d42ab08bec1cb5c516f750600

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, specifically triggered by the 'Collab.collectEmailInfo' method, which is known to be vulnerable to CVE-2007-5659. This vulnerability allows for the execution of arbitrary JavaScript code. The analysis indicates that this JavaScript acts as a stager, likely intended to download and execute a second-stage payload. The presence of multiple JavaScript streams and the critical CVE firing strongly suggest malicious intent.

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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `dbbd3c0df23b72dffbd5ac5a49d41e71b4d2f88c1760c4b3cbfa2800e5dc82df`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `a1aa4ce2cfb918fbf5254e7270e5ab5efa7910b751468964e7e64bd780dd7cee`	deobfuscated-js	PDF JavaScript deobfuscation pass	42372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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