PDF malware analysis — malicious · f856276d4f917adb

MALICIOUS

PDF

9.5 KB

MD5: 007579dbcc5c30ec4eee4d49d82c3cfd SHA-1: afedd2ddd6a9674c8bc151ebc91a4bb3d7471f9e SHA-256: f856276d4f917adbf9690f4c95b42233cc50d7857fbb46158d58706042cc404b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is obfuscated and uses a hex decoder. This script is identified as a stager for CVE-2007-5659, leveraging the Collab.collectEmailInfo method. The primary function of this script is to decode and execute a secondary payload, likely for further malicious activity. The confidence is high due to the critical heuristic firing for CVE-2007-5659 and the presence of deobfuscated JavaScript.

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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `3897ce14907a8ddfabd3e777e5a539d8e6cfcafe896f46cbd95b5d19f3a5e7d2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `a755adb4c74f0d070990df6596eaf33e419d4f7fb5ccc05ec18654f58a9dba1e`	deobfuscated-js	PDF JavaScript deobfuscation pass	44488 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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