PDF malware analysis — malicious · ec56ab0804f4fbc6

MALICIOUS

PDF

11.8 KB

MD5: a652302ba578e1da5af2aa47444785e8 SHA-1: 5a9c6f4a194b55f877191386e652f92d596a165e SHA-256: ec56ab0804f4fbc654fac383efbe63438d97574626875a20a93a950a2767f17b

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. The extracted JavaScript files, particularly 'annotation_subject_callee_hex_stage_000.js' and 'deobfuscated.js', indicate a complex stager designed to download and execute further payloads. The presence of multiple deobfuscated JavaScript artifacts suggests a multi-stage attack. The ClamAV detection further supports the malicious nature of the file.

Heuristics 7

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)
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `c51a5e0b0149e6fe759fdb0aa8cc2fd7e1b0e4af481aa46aaee8e02c1ea3242e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5029 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` `de38c4f92f51ea8dd6f35b0ccd991e82c597e4b09a154562b4fee498470d5109`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12063 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` `3039392849e74dfd2709d88a6c299da382d48151340cf1dc2c9d41c07f68a29f`	deobfuscated-js	PDF JavaScript deobfuscation pass	83501 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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