PDF malware analysis — malicious · fa4657e8a853b820

MALICIOUS

PDF

9.5 KB

MD5: 63ca40bcfe4ef2961b5c8f4d3ebe21f2 SHA-1: 017706f612e2b88daeac71464868e269abb35631 SHA-256: fa4657e8a853b820f49db151c532e504cc8a1b3e67b00ebd61df37a4f2144e89

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 that is obfuscated and hex-encoded. The critical heuristic CVE_2007_5659 indicates that the document exploits a vulnerability in Adobe Reader (CVE-2007-5659) by using the `collab.collectEmailInfo` method to launch a JavaScript stager. This stager then decodes and evaluates a further payload. The presence of multiple JavaScript streams and the specific exploit technique strongly suggest a malicious intent to download and execute further stages.

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` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `e96bd075aecd37bda10f92ac0f4b9e7635178e225c43089fc74f912f45b455c4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5057 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `08511b37314daf5cd4bb0d49bb8fd6a87489e8bc3a8f8cc303e1c042c24a7f18`	deobfuscated-js	PDF JavaScript deobfuscation pass	70930 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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