PDF malware analysis — malicious · 371e42cd2bf22b43

MALICIOUS

PDF

9.6 KB

MD5: b270ba92356db3029cc9447b21bf4e27 SHA-1: 916565374e28c94aef1de1ea2653df9caa739d68 SHA-256: 371e42cd2bf22b43d6dab72be4350caad0ae8cbcfebca0a4af138615f39e1e18

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the `collab.collectEmailInfo` function. This function is used to decode and execute a hex-encoded JavaScript stager. The stager is responsible for downloading and executing a second-stage payload, indicating a downloader or dropper functionality. The high confidence is due to the direct exploitation of a known CVE and the clear stager mechanism.

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` `3db00f228397914760c339d52d8c797a1c8a08835f906bfb75760badbb0526fc`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5192 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` `c12121ad11231068e197cf949e2647b75d1d703ab1e53a3e4e9afda847797b4e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12443 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` `60ad8a0af7be9065022a65c5ff509b5936273502af6e1000cb64c777c310f123`	deobfuscated-js	PDF JavaScript deobfuscation pass	72095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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