PDF malware analysis — malicious · c648423ead329c00

MALICIOUS

PDF

9.5 KB

MD5: a9b1759b59ca28ab451f863ebafd4455 SHA-1: 519878e05986703a763cdff4ec4eaccda8047d45 SHA-256: c648423ead329c005ebbc73caf2ce5d0c07c3341dee89e5ad660ab22c3a21702

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1055.001 Process Injection

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic identifying the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This indicates the document is designed to exploit this known PDF vulnerability to execute arbitrary code. The embedded JavaScript is heavily obfuscated but appears to be a stager, likely intended to download and execute a second-stage payload.

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` `9f19dd8aec366e4460d644d6039d55d42e80bd8f0b44d69561e0786120944d0a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5116 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` `6dd8f84725d5923f5151fe862e0c43f35d333c8b65c57e9ee66c287ebdc319a3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12215 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` `70287b7aecfb71f1de2e70158f00412b0fb4f2e837a5bf6b3b885b1e3319cc7a`	deobfuscated-js	PDF JavaScript deobfuscation pass	45289 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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