PDF malware analysis — malicious · e73859c84690b7b9

MALICIOUS

PDF

9.8 KB

MD5: 7bde4ff9dec45d955ae4c3c711233525 SHA-1: 49030d60543c8bfd6c43c380a0ba9194cc7f2b55 SHA-256: e73859c84690b7b98282deced8f302623507db99fc63c6f275e0e1dee8698cf3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified as a stager for CVE-2007-5659. This JavaScript is heavily obfuscated but deobfuscation reveals it is designed to download and execute a second-stage payload from a remote source. The primary mechanism for this is the use of the `Collab.collectEmailInfo` JavaScript function, which is a known vector for exploiting this CVE. The deobfuscated JavaScript is substantial, indicating a complex payload delivery. No specific family could be identified due to the generic nature of the exploit.

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` `974f2493e8862a021fe96e269dfb0ce263384aad272b48aaf163ff23ad964042`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `6c108b93152b8d8058e7cab1f3a1a06c4a7a6b1d447f541890faf4ef4a85c28f`	deobfuscated-js	PDF JavaScript deobfuscation pass	45871 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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