PDF malware analysis — malicious · 1b7ffaecbe7b63e3

MALICIOUS

PDF

9.6 KB

MD5: 8cdf65e422d9d3f9462e39a539b1e089 SHA-1: 49d47ac350d761d4c6a20cc60f886cc62b91b511 SHA-256: 1b7ffaecbe7b63e3260f7dbe8f0643d05181d371eb6ac8b099629f81f445dc5f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious File T1059.007 JavaScript/JScript

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the 'collab.collectEmailInfo' function. This JavaScript acts as a stager, decoding and executing a larger payload. The analysis indicates this is a common technique for delivering second-stage malware. The specific JavaScript stager was recovered and deobfuscated, confirming its 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` `5dc2a34984e1330fa3bac0ff2619081db2d2e38110c29f4b62ccf89e5acc50a3`	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).
`deobfuscated.js` `fcf79c64fc4332b50505fbfd39dff7e64547d6fe86e825e9b0af2c027053082c`	deobfuscated-js	PDF JavaScript deobfuscation pass	75463 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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