PDF malware analysis — malicious · aef54af3b0bfb20a

MALICIOUS

PDF

9.6 KB

MD5: cdabf5c90c5c7532cef31d85611452fc SHA-1: c46585a1b96564e586bb467947a238d87d736632 SHA-256: aef54af3b0bfb20a12349d76d575c31f93cb7da401ec5f2e88f7a607043bcf51

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 the CVE-2007-5659 vulnerability, specifically targeting the Collab.collectEmailInfo method to stage and execute JavaScript. The primary function of the script appears to be downloading and executing a secondary payload, as suggested by the large size of the deobfuscated JavaScript and the presence of stager-like artifacts. 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 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` `6a77bd43bde4d05455c29de486f25044a35bc3509c8af3f6af15d0803c214f34`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5151 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` `ad679da41e8645ee7dfdd1a6b67c4545e259122a0e5925b6505a6a51c0090020`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12288 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` `ebaca2159b2e3f104e0534b36a9c94be15b45b4a253d7cf4790e47139746c5e9`	deobfuscated-js	PDF JavaScript deobfuscation pass	72792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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