PDF malware analysis — malicious · 525588b6556dd9c4

MALICIOUS

PDF

9.8 KB

MD5: fbd71ef600884bf7607190cf2fcc04e4 SHA-1: cfdd920de50f6bf2f847880ba49df54b7f52f0e1 SHA-256: 525588b6556dd9c4c4ae3f3a08cac016a1d3c1772606b18783f3733644e7afe8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' function, which is a known vulnerability (CVE-2007-5659). This function is used to decode and execute a hex-encoded stager. The stager is responsible for further deobfuscation and execution of a larger payload, likely for malicious purposes such as downloading additional malware or establishing a backdoor. The presence of multiple deobfuscated JavaScript files indicates a complex multi-stage execution process.

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` `6405b8916dc7e19190694f6a123edf8a872204a373777514f5f931c1682f453c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5298 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` `948efb2f17ec6d6257c1cba0078ea5d8d223ac61519539649a5558e57f7a0b70`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	12647 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` `799cb33bf818b9af31ff9d430e6c42dc429cf88d0d8ebc22aadf27a807480186`	deobfuscated-js	PDF JavaScript deobfuscation pass	46935 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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