PDF malware analysis — malicious · ee5b74f428332227

MALICIOUS

PDF

9.1 KB

MD5: e83474ac22f1208a05646521f6f9a4b2 SHA-1: 73e11f85fbdca84b457099170bb1ec37e4ac28d6 SHA-256: ee5b74f428332227baedf87c388577de7796861ce97dfa1e1e5f3692e2b93baa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, including a significant one identified as a hex stager. This stager is designed to decode and execute further malicious code, likely downloading and running a second-stage payload. The critical CVE-2007-5659 heuristic confirms the exploitation of a known PDF vulnerability for code execution. The presence of deobfuscated JavaScript files indicates a complex execution chain aimed at evading detection.

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` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `54a3eb60412d9dcbbe39b398530af529878fd527a1350feff4c6ca726a362faa`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4850 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` `079760a0f37bbc91416e2e568c3aadac6f6622c6aa7d2c5c415ce14135d5ef57`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	11612 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` `1e81d6e9b51c05adc6b0bc75144d89109c1d260ab70e6c18931e4c84bf9cf604`	deobfuscated-js	PDF JavaScript deobfuscation pass	65077 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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