PDF malware analysis — malicious · e85ab85f8862bd03

MALICIOUS

PDF

9.3 KB

MD5: ec616f174eb5a9e10a5eec3ad19ea665 SHA-1: db6d5646db42f425da6d5ad25c4584a2b739084d SHA-256: e85ab85f8862bd0331ec2e407683776f67772c41e339746e908c897870d52ebc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of CVE-2007-5659 via the Collab.collectEmailInfo function, which is used to decode and execute further JavaScript stages. This suggests the document is designed to exploit this vulnerability to deliver a malicious payload. The exact nature of the payload is not clear from the static analysis, but the obfuscation and exploit chain point to a downloader or dropper.

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` `c83ae75e52ab438a4cbcf66fbd91fe098d7cef5485acced19915f6b64035abb2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5052 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` `386cb6f7ab085631934a3767c11f0d93562408b914d7424284fa54656019dd32`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	11967 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` `489cafbf72111543d0023364c68c5eb308e003f56af87a9a4fac8b6e4088ecbc`	deobfuscated-js	PDF JavaScript deobfuscation pass	40826 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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