PDF malware analysis — malicious · 99f53df3bd674c34

MALICIOUS

PDF

9.7 KB

MD5: 9e14263ca1f519bd93c32b270a44553a SHA-1: 68e1989c70601576885c4d79fccf99eb4ae306fc SHA-256: 99f53df3bd674c3465e95d673f88dcf8463a5c2f3d78a98dadbe484f47b173ef

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the `Collab.collectEmailInfo` method. This JavaScript acts as a stager, decoding and executing a larger payload found in the `annotation_subject_callee_hex_stage_000.js` and `deobfuscated.js` artifacts. The primary function appears to be the execution of obfuscated JavaScript, likely to download and run a second-stage payload.

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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `ca6bb7adde977893ea1ce47b7e7cfb739f5b5ee0eea963603e13aaa2fa4be20e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5362 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` `5d54d1da75b15bbc644b45381a2a8a489ab841fba48dd9c5ede75b24cdbe3aff`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	12621 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` `93a6da8c905f262d41ed800f9d240367f2a5fa5fbfea2a7a9264845929902db5`	deobfuscated-js	PDF JavaScript deobfuscation pass	46884 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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