PDF malware analysis — malicious · e1312575a46b873f

MALICIOUS

PDF

MD5: 69f50b012bd4d8fdf319d67bb33618a3 SHA-1: fdbd94ccd93d82a63cf01a82b06eb15fb4d211e6 SHA-256: e1312575a46b873f1518597abb6ee55f093a411a1f6213c809f6c5a84407c4de

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The 'PDF_ANNOT_SUBJECT_HEX_EVAL_STAGER' heuristic suggests that the annotation subject is used to decode and execute a stager. The extracted JavaScript artifacts, such as 'javascript_obj0004_000.js', 'numeric_charcode_stage_000.js', and 'legacy_pdfkit_stage_000.js', likely contribute to downloading and executing a second-stage payload. The exact nature of the payload is not discernible from the provided evidence, but the overall mechanism points to a downloader.

Heuristics 6

Annotation subject hex-decoded eval stager critical PDF_ANNOT_SUBJECT_HEX_EVAL_STAGER

PDF OpenAction JavaScript decodes a decimal char-code launcher, enumerates annotation subjects with syncAnnotScan()/getAnnots(), turns dash-delimited hex bytes into JavaScript with String.fromCharCode(), and evals the staged result. This is an exploit-kit delivery pattern and not normal PDF form logic.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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. (identified after JavaScript deobfuscation)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `b8afb5a7ba8b476ad5f84dd9a65b418dfd42876e85210804f937d30afffac798`	pdf-javascript-stream	PDF /JS object 4 at offset 0x2B7	1858 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `4718a27c2224fc36bf24f8e8e04598f1ad78adce4401c7be2708318738a6983d`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x2C7	469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0be39620d4258796ba3cea710099e4c6d711c0df8649cf2af9224d7fb3ffb576`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B4F	11963 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).

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