PDF malware analysis — malicious · 4d62fa51840b069a

MALICIOUS

PDF

9.0 KB

MD5: eec5604669393536d064532be3d419aa SHA-1: 19ba37b5774178471beab6658b3b45be2ec7f3fc SHA-256: 4d62fa51840b069a3837dcce2b76cf9c31e337959eaf0afb59afcb0ecde2bb26

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, with a critical heuristic identifying the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This indicates the document is designed to exploit this known vulnerability to execute arbitrary JavaScript. The deobfuscated JavaScript is extensive, suggesting it is responsible for downloading and executing a second-stage payload, which is a common attack pattern for this type of exploit.

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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `61bd69e7354a20e71bb89f268b772e77cd2afd46c093c7ad612286d57b14fab7`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4754 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` `ccc6991a1f5215a46825d423544d6660266cee7cb1208141cbedb5d51fa9a863`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	11461 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` `3381121b30e02c25f4200a6fc716bec58e07d458c5148f5c5284a0f73a5a8de2`	deobfuscated-js	PDF JavaScript deobfuscation pass	64551 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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