PDF malware analysis — malicious · f6cb68d0b4b8e792

MALICIOUS

PDF

9.5 KB

MD5: f68c1dc4044d5deda8c45f93416a7539 SHA-1: 79d26e4dee8cae71f997b9fd00f2419bbd341aa2 SHA-256: f6cb68d0b4b8e792e39f35307f89116c63cabe5d17c51720e5595cbc6cc54fe6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1071.001 Web Protocols

The PDF sample contains multiple embedded JavaScript streams, with the primary one identified as a CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function. This script acts as a stager, deobfuscating and executing further stages of malicious code. The presence of deobfuscated JavaScript files indicates a complex, multi-stage payload delivery mechanism. The exact download URL for the second-stage payload could not be definitively reconstructed from the provided evidence.

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` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `678ace75e219bd8588becbca2f871170769efae7546168f6b0c390a4b20d0261`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5190 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` `74c87a2d8f3314ad74535028f047b04b2f9b4ecd859fb86e04af5fda58cf3ba6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12217 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` `eba6dabd884f50b5f75f5b62a68be4d099c2864948814dedc13abb6e2d403e04`	deobfuscated-js	PDF JavaScript deobfuscation pass	44570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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